f(x)=(2x-21)(x^2+36)

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Solution for f(x)=(2x-21)(x^2+36) equation: 


Simplifying
f(x) = (2x + -21)(x2 + 36)

Multiply f * x
fx = (2x + -21)(x2 + 36)

Reorder the terms:
fx = (-21 + 2x)(x2 + 36)

Reorder the terms:
fx = (-21 + 2x)(36 + x2)

Multiply (-21 + 2x) * (36 + x2)
fx = (-21(36 + x2) + 2x * (36 + x2))
fx = ((36 * -21 + x2 * -21) + 2x * (36 + x2))
fx = ((-756 + -21x2) + 2x * (36 + x2))
fx = (-756 + -21x2 + (36 * 2x + x2 * 2x))
fx = (-756 + -21x2 + (72x + 2x3))

Reorder the terms:
fx = (-756 + 72x + -21x2 + 2x3)
fx = (-756 + 72x + -21x2 + 2x3)

Solving
fx = -756 + 72x + -21x2 + 2x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -756x-1 + 72 + -21x + 2x2

Simplifying
f = -756x-1 + 72 + -21x + 2x2

Reorder the terms:
f = 72 + -756x-1 + -21x + 2x2

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