A) -5a(a^2-3a-4)= б) (m-2n)(m+2n-1)= в) (a^3-a^2+a-1)(a+1)=

Question

A) -5a(a^2-3a-4)=
б) (m-2n)(m+2n-1)=
в) (a^3-a^2+a-1)(a+1)=

Answer 1

= -5а³ + 15а² + 20
= m² +2mn - m - 2mn - 4n² + 2n = m² - 4n² + 2n - m
= a^4 - a³ + a² - a + a³ - a² + a - 1 = a^4 - 1