Question

Выполни умножение: (u−2)(7u+1)(4u−7)
Ответ:
Помогите

Answer 1

(u - 2)(7u + 1)(4u - 7) = 
= ( 7u(u - 2) + u - 2) (4u - 7) = 
= (7u^2 - 14u + u - 2)(4u - 7) = 
= (7u^2 - 13u - 2)(4u - 7) = 
= 7u^2 (4u - 7) - 13u(4u - 7) - 2(4u - 7) = 
= 28u^3 - 49u^2 - 52u^2 + 91u - 8u + 14 = 
= 28u^3 - 101u^2 + 83u + 14