Question

преобразуйте в произведение:
1)9-25(4-х)²
2)1-36(3у-1)²
3)4-9(а+б)²

Answer 1

$1)9-25(4-x)^2=(3-5)(3+5)(16-8x+x^2)$
$2)1-36(3y-1)^2=(1-6)(1+6)(9y^2-6y+1)$
$3)4-9(a+b)^2=(2-3)(2+3)(a^2+2ab+b^2)$

Answer 2

=)