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

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


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

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

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

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

Combine like terms: 3x + -7x = -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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