Evaluate: (a-2b)(a + 2b)

My answer

a^2 + -4b^2 = -4a^2b^2

Does that look right?

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- Jul 5th 2005, 04:32 PMHayabusaneed help w/problem
Evaluate: (a-2b)(a + 2b)

My answer

a^2 + -4b^2 = -4a^2b^2

Does that look right? - Jul 5th 2005, 08:55 PMMathMan
The answer is just $\displaystyle a^2 - 4b^2$

You cannot combine the $\displaystyle a^2 $and the $\displaystyle -4b^2$ - Jul 6th 2005, 08:11 AMHayabusa
thank you :D