Question

Multiply (5a+7)(5a-7)

Answer 1

=25a^2-49
Steps
1)Simplify:(5a)^2-7^2
2)evaluate:25a^2-49

Answer 2

25a^2-49

Explanation:

1)use FOIL

F=first

O=out

I=inside

L=last

5a*5a+5a*-7+7*5a*7*-7

25a^2-35a+35a-49

25a^2-49

Hope this helps!