y=(x+10)(x-9)

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Solution for y=(x+10)(x-9) equation: 


Simplifying
y = (x + 10)(x + -9)

Reorder the terms:
y = (10 + x)(x + -9)

Reorder the terms:
y = (10 + x)(-9 + x)

Multiply (10 + x) * (-9 + x)
y = (10(-9 + x) + x(-9 + x))
y = ((-9 * 10 + x * 10) + x(-9 + x))
y = ((-90 + 10x) + x(-9 + x))
y = (-90 + 10x + (-9 * x + x * x))
y = (-90 + 10x + (-9x + x2))

Combine like terms: 10x + -9x = 1x
y = (-90 + 1x + x2)

Solving
y = -90 + 1x + x2

Solving for variable 'y'.

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

Simplifying
y = -90 + 1x + x2

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