how to write f(x) = (x+3)(x+3)(x-2) in expanded form of f(x)

Answer 1

f(x) = (x+3)(x+3)(x-2) = (x+3)²(x-2)

f(x) = (x-2)(x²+6x+9) = x(x²+6x+9)-2(x²+6x+9)

= x³+6x²+9x -2x²-12x -18

= x³+4x²-3x-18