Question

Which expresions is equivalent to 2a + 5(b + 7a)?

Answer 1

Correct answer is B.

$2a+5(b+7a)=2a+5*b+5*7b=2a+5b+35a=37a+5b$ :)

Answer 2

$2a + 5(b + 7a)\\\\\sf{Distribute~the~5}\\\\\sf{Distributive ~property:~a(b+c)=ab+ac}\\\\2a + 5(b + 7a)\\\\=2a + 5b + 5(7a)\\\\=2a + 5b + 35a\\\\=\boxed{\bf{37a+5b}}$

Your final answer is B.