Question

Помогите
7a^2-7b^2
y^4-81
8a^2-5a-8ax+5x

Answer 1

Ответ:

$7a^2-7b^2 = 7(a^2 - b^2) = 7(a - b)(a+b)$

$y^4 - 81 = (y^2 - 9)(y^2 + 9) = (y - 3)(y +3)(y^2+9)$

$8a^2-5a-8ax+5x = a(8a - 5) - x(8a - 5) = (a - x)(8a - 5)$

Answer 2

1) 7(a-b)(a+b)

2) (y^2+9)(y-3)(y+3)

3) a(8a-5-3x)