3 years ago

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

Mathematics

2 answers:

soldier1979 [14.2K]3 years ago

6 0

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

vovikov84 [41]3 years ago

5 0

Answer:

25a^2-49

Step-by-step 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!

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