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

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


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

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

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

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

Combine like terms: -5x + -4x = -9x
(20 + -9x + x2) = f(x)

Multiply f * x
20 + -9x + x2 = fx

Solving
20 + -9x + x2 = fx

Solving for variable 'x'.

Reorder the terms:
20 + -1fx + -9x + x2 = fx + -1fx

Combine like terms: fx + -1fx = 0
20 + -1fx + -9x + x2 = 0

The solution to this equation could not be determined.

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