y=(x+9)(x-7)

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Solution for y=(x+9)(x-7) equation: 


Simplifying
y = (x + 9)(x + -7)

Reorder the terms:
y = (9 + x)(x + -7)

Reorder the terms:
y = (9 + x)(-7 + x)

Multiply (9 + x) * (-7 + x)
y = (9(-7 + x) + x(-7 + x))
y = ((-7 * 9 + x * 9) + x(-7 + x))
y = ((-63 + 9x) + x(-7 + x))
y = (-63 + 9x + (-7 * x + x * x))
y = (-63 + 9x + (-7x + x2))

Combine like terms: 9x + -7x = 2x
y = (-63 + 2x + x2)

Solving
y = -63 + 2x + x2

Solving for variable 'y'.

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

Simplifying
y = -63 + 2x + x2

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