# Factoring - another problem

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• March 18th 2008, 03:27 PM
mt_lapin
Factoring - another problem
Factor $4x^2-4x-80$

My answer: $4(x+4)(x-5)$

Do I have the correct answer?

Thank you in advance!
• March 18th 2008, 03:30 PM
iknowone
Yes. A good way to check is to take your answer and do the reverse of factoring. Multiply it all out and see if you recover what you started with.
• March 18th 2008, 03:31 PM
rualin
You should never ask if your factoring is right since you can always multiply out and check. (Yes)
• March 18th 2008, 03:31 PM
mt_lapin
Okay. Thanks!