Question

Выполните умножение.
2(a-7)(1-3a) =
–5(b+4)(–2b-1) =
-4(-c-3)(2c – 5) =​

Answer 1

Ответ:

2(a-7)(1-3a) = (2a -14)(1-3a)= -6a^2+42a+2a-14=-6a^2+44a-14

–5(b+4)(–2b-1) = -5(-2b^2-b-8b-4)=10b^2+45b+20

-4(-c-3)(2c – 5) =​ -4(-2c^2+5c-6c+15)=8c^2+4c-60