5a^3×(-3a^2)^2=? (4x-3y)^2-(2x-y)(2x+y)=?

Question

5a^3×(-3a^2)^2=?
(4x-3y)^2-(2x-y)(2x+y)=?

Answer 1

1) 5a^3•(-3a^2)^2=5a^3•(3a^2)^2=5a^3•3^2•(a^2)^2=5a^3•9a^4=45a^7
2) (4x-3y)^2-(2x-y)(2x+y)=16x^2-24xy+9y^2-(4x^2-y^2)=16x^2-24xy+9y^2-4x^2+y^2=12x^2-24xy+10y^2

Comments

Спасибо