Y=(X+4)(X-9)

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Solution for Y=(X+4)(X-9) equation: 


Simplifying
Y = (X + 4)(X + -9)

Reorder the terms:
Y = (4 + X)(X + -9)

Reorder the terms:
Y = (4 + X)(-9 + X)

Multiply (4 + X) * (-9 + X)
Y = (4(-9 + X) + X(-9 + X))
Y = ((-9 * 4 + X * 4) + X(-9 + X))
Y = ((-36 + 4X) + X(-9 + X))
Y = (-36 + 4X + (-9 * X + X * X))
Y = (-36 + 4X + (-9X + X2))

Combine like terms: 4X + -9X = -5X
Y = (-36 + -5X + X2)

Solving
Y = -36 + -5X + X2

Solving for variable 'Y'.

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

Simplifying
Y = -36 + -5X + X2

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