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Old 07-17-2017, 01:27 PM   #1
lbbf
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Default Math whiz?

My son is taking college algebra and he has a problem that I just can't seem to figure out. (I hate math!)

-5X^2 +17X +20

Factoring USED to be the one thing I was good at but it has been more years that I care to admit.
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Old 07-17-2017, 01:29 PM   #2
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nevermind. I wasnt thinking
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Old 07-17-2017, 01:31 PM   #3
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That gives me a headache just looking at it. I can barely remember the order of operations and to balance the equation. I can not however remember how to do it all though....
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Old 07-17-2017, 01:33 PM   #4
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Pi R round, Cornbread R Square
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Old 07-17-2017, 01:41 PM   #5
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Are you wanting it factored?
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Old 07-17-2017, 01:44 PM   #6
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yes. As far as I can tell it isn't possible to factor with these numbers.
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Old 07-17-2017, 01:47 PM   #7
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Google Quadratic Formula
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Old 07-17-2017, 01:50 PM   #8
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use the quadratic equation to solve. x=​(−bą√(​b​2​​−4ac​​​​​))/2a
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Old 07-17-2017, 01:51 PM   #9
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If it's asking to solve by factoring, it cant be done with rational numbers. In other words, "there are no like terms". That 17 is trouble factor-wise. Maybe a mistype? If it's asking to solve with the quadratic formula, it gets some funky numbers as well.

Quad Formula: x = {-b +/- [sqrt(b^2 - 4ac)]} / 2a

where ax^2+ bx + c = 0.

Solve for both X's (+/-) and plug into original formula.?

Someone correct me if i'm wrong. A bit rusty.
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Old 07-17-2017, 01:52 PM   #10
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You can't really factor this completely but...
Take the x out and get x(-5x+17) + 20

or..

(5x-2)(-x+3) + 26
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Old 07-17-2017, 01:53 PM   #11
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Quadratic formula is if the equation is equal to 0. This equation is not equal to 0 and you are not solving for x. Just simply factoring.
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Old 07-17-2017, 01:53 PM   #12
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My TI-89 tells me "Too few arguments"! What are you solving for?

If it's factoring...
-(5x^2-17x-20)

Last edited by jlinville; 07-17-2017 at 01:57 PM..
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Old 07-17-2017, 01:59 PM   #13
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what's the problem?

If you set it equal to zero the roots are 4.32 & -0.92.
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Old 07-17-2017, 02:00 PM   #14
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Graph it and find the 2 points it crosses the X-Axis. Those 2 points are the "zeros" of the factor and function.

https://www.desmos.com/calculator
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Old 07-17-2017, 02:00 PM   #15
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Quote:
Originally Posted by dbenn454 View Post
You can't really factor this completely but...
Take the x out and get x(-5x+17) + 20

or..

(5x-2)(-x+3) + 26
This is the answer the Professor wants. In either that form or like this since it is more refined (5x-2)(3-x) + 26 = -5x^2 +17x + 20
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Old 07-17-2017, 02:00 PM   #16
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Its factoring people, not solving.
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Old 07-17-2017, 02:04 PM   #17
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Google......
Be gettin' a work out in this thread...
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Old 07-17-2017, 02:06 PM   #18
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-(5x^2-17x-20)
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Old 07-17-2017, 02:06 PM   #19
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So her is what my wife the math major came up with.

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Old 07-17-2017, 02:13 PM   #20
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Quote:
Originally Posted by dbenn454 View Post
Its factoring people, not solving.
Actually, the OP didn't clarify if the problem was asked to be factored or solved.

But in reality, solving and factoring are one-in-the same in that they simply put the original equation in a format to allow the user to find the numerical solutions for the variable.

The difference is semantic and only teachers and people interested in theory care for the difference between the two.

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Old 07-17-2017, 02:17 PM   #21
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Quote:
Originally Posted by StrayDog View Post
Actually, the OP didn't clarify if the problem was asked to be factored or solved.

But in reality, solving and factoring are one-in-the same in that they simply put the original equation in a format to allow the user to find the numerical solutions for the variable.

The difference is semantic and only teachers and people interested in theory care for the difference between the two.

If it was solving it would say -5x^2 +17x+20 = 0. There is a huge difference. He said in the original post FACTORING used to be what he was good at. There is no equals sign so this is not solving. You cannot solve if this is not equal to something. OP can clear it all up, but I'm not wrong.
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Old 07-17-2017, 02:18 PM   #22
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No thanks, I've done enough thinking for the day.
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Old 07-17-2017, 02:20 PM   #23
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Quote:
Originally Posted by dbenn454 View Post
This is the answer the Professor wants. In either that form or like this since it is more refined (5x-2)(3-x) + 26 = -5x^2 +17x + 20
This ^^^
brought back what I learned ~30 years ago.

TO check him, multipy what's in parenthesis
FOIL
First - (15x)
Outside- (-5x^2)
Inside - (-6)
Last - (2x)
= -5x^2+15x+2x-6(+26)
= -5x^2+17x+20
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Old 07-17-2017, 02:20 PM   #24
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Actually, the OP didn't clarify if the problem was asked to be factored or solved.

But in reality, solving and factoring are one-in-the same in that they simply put the original equation in a format to allow the user to find the numerical solutions for the variable.

The difference is semantic and only teachers and people interested in theory care for the difference between the two.


Post #5 I was asked it I wanted it factored. Post #6 I answered yes. Still I'm going to send him off to the math tutor to find out how his prof. wants this done.
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Old 07-17-2017, 02:20 PM   #25
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Beer me
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Old 07-17-2017, 02:21 PM   #26
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Thanks for all the help. Now I have a headache and need to lie down.
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Old 07-17-2017, 02:22 PM   #27
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Quote:
Originally Posted by lbbf View Post


Post #5 I was asked it I wanted it factored. Post #6 I answered yes. Still I'm going to send him off to the math tutor to find out how his prof. wants this done.

I bet you a bag of pea gravel I'm right.

Last edited by dbenn454; 07-17-2017 at 02:23 PM.. Reason: *
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Old 07-17-2017, 02:24 PM   #28
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Quote:
Originally Posted by dbenn454 View Post
I bet you a bag of pea gravel I'm right.
Vanilla flavored!
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Old 07-17-2017, 02:29 PM   #29
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I could tell you but than neither one of you (or the rest of TBH) would know how to solve the equation in the future.
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Old 07-17-2017, 02:30 PM   #30
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Sorry...I forgot the in my previous ramblings.

Is this that new skooling they be doing nowadays
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Old 07-17-2017, 02:31 PM   #31
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3
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Old 07-17-2017, 02:32 PM   #32
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purple!
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Old 07-17-2017, 02:35 PM   #33
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iffin it was a multiple choice question I'd pick C unless D was all of the above, than I'd most "defiantly" choose D
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Old 07-17-2017, 02:38 PM   #34
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Omg....I'm going back to the wgi feeder thread. I have no business here.
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Old 07-17-2017, 02:57 PM   #35
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7
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Old 07-17-2017, 03:02 PM   #36
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That reminds me of why College Algebra II was the only class I ever dropped in school. I hate that sheet.
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Old 07-17-2017, 03:26 PM   #37
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X=-20/37
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Old 07-17-2017, 04:03 PM   #38
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This is why I got into sales.

No maths
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Old 07-17-2017, 04:31 PM   #39
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Quote:
Originally Posted by dbenn454 View Post
I bet you a bag of pea gravel I'm right.
I'm not about to argue with answers given. At this point I believe purple is the correct answer, but Cornbread R Square hasn't been completely ruled out yet.
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Old 07-18-2017, 10:33 PM   #40
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I don't remember much from college but I believe this is acceptable to forget

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Old 07-18-2017, 10:48 PM   #41
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WTH is that? I'd have a better chance of translating Mandarin Chinese then solve that!
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Old 07-18-2017, 10:55 PM   #42
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This is why I absolutely hate math.

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Old 07-18-2017, 10:56 PM   #43
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Yall gave me a headache
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Old 07-18-2017, 11:16 PM   #44
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Quote:
Originally Posted by lbbf View Post
I'm not about to argue with answers given. At this point I believe purple is the correct answer, but Cornbread R Square hasn't been completely ruled out yet.
Agree!! Let's get back to the cornbread.
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Old 07-18-2017, 11:22 PM   #45
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Huh, i thought the only college algebra course was linear algebra. Wait til your kid takes partial differential equations and asks you about laplace transforms. Your brain will explode
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Old 07-19-2017, 05:25 AM   #46
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Quote:
Originally Posted by JLivi1224 View Post
Agree!! Let's get back to the cornbread.

Mexican Cornbread ;-)

Some one said purple.
I'd have to agree.
Here's how I arrived at it ;-)

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Old 07-19-2017, 06:13 AM   #47
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Quote:
Originally Posted by Graysonhogs View Post
No thanks, I've done enough thinking for the day.
I have enough trouble using real math. The stuff they teach in school is crazy. Especially algebra.
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Old 07-19-2017, 06:37 AM   #48
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Quote:
Originally Posted by Pushbutton2 View Post
Mexican Cornbread ;-)

Some one said purple.
I'd have to agree.
Here's how I arrived at it ;-)

Attachment 863480
Love me some mexican cornbread
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Old 07-19-2017, 06:49 AM   #49
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The function doesn't factor 'evenly'. Use the quadratic formula as others have said and you'll come up with your two solutions. See post #9...BHD has it right.
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Old 07-19-2017, 08:39 AM   #50
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Holy xxit. I have no business in here either. I have never even seen such as this. I'm out
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