f(x)=x(x-1)(x+2)

Solution for f(x)=x(x-1)(x+2) equation:

Simplifying
f(x) = x(x + -1)(x + 2)

Multiply f * x
fx = x(x + -1)(x + 2)

Reorder the terms:
fx = x(-1 + x)(x + 2)

Reorder the terms:
fx = x(-1 + x)(2 + x)

Multiply (-1 + x) * (2 + x)
fx = x(-1(2 + x) + x(2 + x))
fx = x((2 * -1 + x * -1) + x(2 + x))
fx = x((-2 + -1x) + x(2 + x))
fx = x(-2 + -1x + (2 * x + x * x))
fx = x(-2 + -1x + (2x + x2))

Combine like terms: -1x + 2x = 1x
fx = x(-2 + 1x + x2)
fx = (-2 * x + 1x * x + x2 * x)
fx = (-2x + 1x2 + x3)

Solving
fx = -2x + 1x2 + x3

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = -2 + x + x2

Simplifying
f = -2 + x + x2