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

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


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

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

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

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

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

Solving
y = -20x + 1x2 + x3

Solving for variable 'y'.

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

Simplifying
y = -20x + 1x2 + x3

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