y=(x+9)(x-1)

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Solution for y=(x+9)(x-1) equation: 


Simplifying
y = (x + 9)(x + -1)

Reorder the terms:
y = (9 + x)(x + -1)

Reorder the terms:
y = (9 + x)(-1 + x)

Multiply (9 + x) * (-1 + x)
y = (9(-1 + x) + x(-1 + x))
y = ((-1 * 9 + x * 9) + x(-1 + x))
y = ((-9 + 9x) + x(-1 + x))
y = (-9 + 9x + (-1 * x + x * x))
y = (-9 + 9x + (-1x + x2))

Combine like terms: 9x + -1x = 8x
y = (-9 + 8x + x2)

Solving
y = -9 + 8x + x2

Solving for variable 'y'.

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

Simplifying
y = -9 + 8x + x2

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