Question

12ab-18b^2
21x^7-7x^4
8x-8y+ax-ay
^-это степеь

Answer 1

$1)12ab - 18 {b}^{2} = 6b(2a - 3b)$
$2)21 {x}^{7} - 7 {x}^{4} = 7 {x}^{4} (3 {x}^{3} - 1)$
$3)8(x - y) + a(x - y) = \\ (x -y )(8 + a)$