y=-(x+7)(x-3)

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Solution for y=-(x+7)(x-3) equation: 


Simplifying
y = -1(x + 7)(x + -3)

Reorder the terms:
y = -1(7 + x)(x + -3)

Reorder the terms:
y = -1(7 + x)(-3 + x)

Multiply (7 + x) * (-3 + x)
y = -1(7(-3 + x) + x(-3 + x))
y = -1((-3 * 7 + x * 7) + x(-3 + x))
y = -1((-21 + 7x) + x(-3 + x))
y = -1(-21 + 7x + (-3 * x + x * x))
y = -1(-21 + 7x + (-3x + x2))

Combine like terms: 7x + -3x = 4x
y = -1(-21 + 4x + x2)
y = (-21 * -1 + 4x * -1 + x2 * -1)
y = (21 + -4x + -1x2)

Solving
y = 21 + -4x + -1x2

Solving for variable 'y'.

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

Simplifying
y = 21 + -4x + -1x2

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