Question

Выполните умножение многочленов 1.(x+3)(x-3x+9)=
2.(2x – 3y)(4x2 +6xy + 9y2) =

Answer 1

1. (x + 3)(x - 3x + 9) = x(x - 3x + 9) + 3(x - 3x + 9) = x² - 3x² + 9x + 3x - 9x + 27 = -2x² + 3x + 27

2. (2x - 3y)(4x² + 6xy + 9y²) = (2x)³ - (3y)³ = 8x³ - 27y³