Homework Help: math

Posted by krystal on Monday, February 16, 2009 at 7:06pm.

I've worked these problems but I was just wondering if someone could check over them to see if they're correct...if not please help!

(u-2)(u+7)
my answer: 7u^2-49u

(5t-4)^2
my answer: 25t^2-40+16

Thank you :)

math - Damon, Monday, February 16, 2009 at 7:21pm
hmm, well use either FOIL or the distributive property. I will use distributive property:
(u-2)(u+7)
my answer: 7u^2-49u
-----------------------
u(u+7) -2(u+7)
u^2 + 7u - 2u - 14
=
u^2 + 5 u - 14
===============================
math - Damon, Monday, February 16, 2009 at 7:22pm
25t^2-40+16
You forgot a t
25t^2-40t+16

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