y=(x-1)(x+2)

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Solution for y=(x-1)(x+2) equation: 


Simplifying
y = (x + -1)(x + 2)

Reorder the terms:
y = (-1 + x)(x + 2)

Reorder the terms:
y = (-1 + x)(2 + x)

Multiply (-1 + x) * (2 + x)
y = (-1(2 + x) + x(2 + x))
y = ((2 * -1 + x * -1) + x(2 + x))
y = ((-2 + -1x) + x(2 + x))
y = (-2 + -1x + (2 * x + x * x))
y = (-2 + -1x + (2x + x2))

Combine like terms: -1x + 2x = 1x
y = (-2 + 1x + x2)

Solving
y = -2 + 1x + x2

Solving for variable 'y'.

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

Simplifying
y = -2 + 1x + x2

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