Question

Help, again???
Find the product of (2x + 5y)(2x − 5y).

Answer 1

same as before

\[a^2-b^2=(a+b)(a-b)\] with
\[a=2x,b=5y\]

Answer 2

be a little careful and put
\[(2x)^2-(5y)^2\] and then square the 2 and the 5

Answer 3

Okay... I think I got it. so it's 4x^2 + 25y^2?

Answer 4

yes but with negative sign..

Answer 5

oh, okay! Thanks!