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

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


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

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

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

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

Combine like terms: 1x + -9x = -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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