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

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

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

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

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

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

Combine like terms: 3x + -1x = 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