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

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


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

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

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

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

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

Solving
y = -21 + 4x + x2

Solving for variable 'y'.

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

Simplifying
y = -21 + 4x + x2

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