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

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


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

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

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

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

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

Solving
y = -20 + -1x + x2

Solving for variable 'y'.

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

Simplifying
y = -20 + -1x + x2

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