Question

fatorar: 4a + 4b + xa + xb

Answer 1

$4a + 4b + xa + xb \\ 4 (a+b) + x (a+b)$

Answer 2

.....4a + 4b + xa + xb....
......4(a+b) + x(a+b).....
= .....(a+b)* (4+x).....