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

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


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

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

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

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

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

Combine like terms: -5x + 4x = -1x
fx = x(-20 + -1x + x2)
fx = (-20 * x + -1x * x + x2 * x)
fx = (-20x + -1x2 + x3)

Solving
fx = -20x + -1x2 + x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -20 + -1x + x2

Simplifying
f = -20 + -1x + x2

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