Question

Упростите выражения: (y+4)(y-3)+(y-3)(y+3);(3c-5)²+30c

Answer 1

(y+4)×(y-3)+(y-3)×(y+3)=(2y+7)×(y-3)
(3c-5)²+30c = 9c²+25

Answer 2

Незачто!