Question

Simplify ( x + 3 )( x^2 - 3x + 9 )

Answer 1

= x^3 + 27

Explanation:

(x+3)(x^2-3x+9)

x^3 - 3x^2 + 9x + 3x^2 - 9x + 27

x^3 - 3x^2 + 3x^2 + 9x - 9x + 27

3x^2 - 3x^2 = 0

9x - 9x = 0

x^3 + 27