f(x)=(x-3)(2x+6)

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Solution for f(x)=(x-3)(2x+6) equation:


Simplifying
f(x) = (x + -3)(2x + 6)

Multiply f * x
fx = (x + -3)(2x + 6)

Reorder the terms:
fx = (-3 + x)(2x + 6)

Reorder the terms:
fx = (-3 + x)(6 + 2x)

Multiply (-3 + x) * (6 + 2x)
fx = (-3(6 + 2x) + x(6 + 2x))
fx = ((6 * -3 + 2x * -3) + x(6 + 2x))
fx = ((-18 + -6x) + x(6 + 2x))
fx = (-18 + -6x + (6 * x + 2x * x))
fx = (-18 + -6x + (6x + 2x2))

Combine like terms: -6x + 6x = 0
fx = (-18 + 0 + 2x2)
fx = (-18 + 2x2)

Solving
fx = -18 + 2x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -18x-1 + 2x

Simplifying
f = -18x-1 + 2x

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