y=-(x+1)(x-3)

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Solution for y=-(x+1)(x-3) equation: 


Simplifying
y = -1(x + 1)(x + -3)

Reorder the terms:
y = -1(1 + x)(x + -3)

Reorder the terms:
y = -1(1 + x)(-3 + x)

Multiply (1 + x) * (-3 + x)
y = -1(1(-3 + x) + x(-3 + x))
y = -1((-3 * 1 + x * 1) + x(-3 + x))
y = -1((-3 + 1x) + x(-3 + x))
y = -1(-3 + 1x + (-3 * x + x * x))
y = -1(-3 + 1x + (-3x + x2))

Combine like terms: 1x + -3x = -2x
y = -1(-3 + -2x + x2)
y = (-3 * -1 + -2x * -1 + x2 * -1)
y = (3 + 2x + -1x2)

Solving
y = 3 + 2x + -1x2

Solving for variable 'y'.

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

Simplifying
y = 3 + 2x + -1x2

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