Question

factor a(x + 2) + 3(x + 2)

Answer 1

It's mostly like your grouping questions. Assume \(\rm x + 2 = n\). You have,\[\rm an + 3n\]How would you combine like terms?

Answer 2

take x+2 as common you will get
(x+2)(a+3)

Answer 3

Assume \[(x+2)\] is another way of saying \[b\].

Then, \[ab + 3b\].

So. just factor the \[b\] out to get:
\[b(a+3)\].

Substitute the (x+2) back in:

\[(x+2)(a+3)\]