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View Full Version : Did I do this right? (factor -12x^2 - 13x + 4)



05-15-2006, 09:18 AM
if i was to factor down

-12x^2-13x+4=0

would i get...

(-4x-13)(3x-1)

happy
05-15-2006, 09:34 AM
if i was to factor down

-12x^2-13x+4=0

would i get...

(-4x-13)(3x-1)

Don't private message me. Your answer is wrong. How did you arrive at it?

05-15-2006, 09:41 AM
i took the -12x^ and the 4 and found a common factor and went form there! how is it wrong?

happy
05-15-2006, 09:42 AM
i took the -12x^ and the 4 and found a common factor and went form there! how is it wrong?

Check it. Multiply what you have out and tell me what you get.

stapel
05-15-2006, 10:26 AM
i took the -12x^ and the 4 and found a common factor and went form there!
Please reply showing your steps. For instance, how did you arrive at "(-13)(-4) = +4"?

Thank you.

Eliz.

05-15-2006, 08:10 PM
umm i do also want to ask how you got there
ok, when you get an answer, always foil it back to check

you got: (-4x-13)(3x-1)
do you know how to foil?
if not, then i suggest you study that first
if you do, try to foil it

ok, so you got this: -12x^2-13x+4=0
there is another way you can do this...
hint: try to take out the negative sign on the first "x" variable somehow :)

I hope this helps

galactus
05-16-2006, 06:37 AM
Find two numbers which when multiplied equal -48(because (-12)(4)=-48)
and when added equal -13.

-16 and 3

(-16)(3)=-48, -16+3=-13

{-12}x^{2}-13x+4

{-12}x^{2}-16x+3x+4

({-12}x^{2}-16x)+(3x+4)

Now finish?.