f(x)=(x+5)(x-8)

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Solution for f(x)=(x+5)(x-8) equation: 


Simplifying
f(x) = (x + 5)(x + -8)

Multiply f * x
fx = (x + 5)(x + -8)

Reorder the terms:
fx = (5 + x)(x + -8)

Reorder the terms:
fx = (5 + x)(-8 + x)

Multiply (5 + x) * (-8 + x)
fx = (5(-8 + x) + x(-8 + x))
fx = ((-8 * 5 + x * 5) + x(-8 + x))
fx = ((-40 + 5x) + x(-8 + x))
fx = (-40 + 5x + (-8 * x + x * x))
fx = (-40 + 5x + (-8x + x2))

Combine like terms: 5x + -8x = -3x
fx = (-40 + -3x + x2)

Solving
fx = -40 + -3x + 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 = -40x-1 + -3 + x

Simplifying
f = -40x-1 + -3 + x

Reorder the terms:
f = -3 + -40x-1 + x

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