f(x)=(x+5)(x-4)

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Solution for f(x)=(x+5)(x-4) equation:


Simplifying
f(x) = (x + 5)(x + -4)

Multiply f * x
fx = (x + 5)(x + -4)

Reorder the terms:
fx = (5 + x)(x + -4)

Reorder the terms:
fx = (5 + x)(-4 + x)

Multiply (5 + x) * (-4 + x)
fx = (5(-4 + x) + x(-4 + x))
fx = ((-4 * 5 + x * 5) + x(-4 + x))
fx = ((-20 + 5x) + x(-4 + x))
fx = (-20 + 5x + (-4 * x + x * x))
fx = (-20 + 5x + (-4x + x2))

Combine like terms: 5x + -4x = 1x
fx = (-20 + 1x + x2)

Solving
fx = -20 + 1x + x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -20x-1 + 1 + x

Simplifying
f = -20x-1 + 1 + x

Reorder the terms:
f = 1 + -20x-1 + x

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