y=(5x+9)(x-9)

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Solution for y=(5x+9)(x-9) equation: 


Simplifying
y = (5x + 9)(x + -9)

Reorder the terms:
y = (9 + 5x)(x + -9)

Reorder the terms:
y = (9 + 5x)(-9 + x)

Multiply (9 + 5x) * (-9 + x)
y = (9(-9 + x) + 5x * (-9 + x))
y = ((-9 * 9 + x * 9) + 5x * (-9 + x))
y = ((-81 + 9x) + 5x * (-9 + x))
y = (-81 + 9x + (-9 * 5x + x * 5x))
y = (-81 + 9x + (-45x + 5x2))

Combine like terms: 9x + -45x = -36x
y = (-81 + -36x + 5x2)

Solving
y = -81 + -36x + 5x2

Solving for variable 'y'.

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

Simplifying
y = -81 + -36x + 5x2

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