Y=-2(x+4)(x-5)

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Solution for Y=-2(x+4)(x-5) equation: 


Simplifying
Y = -2(x + 4)(x + -5)

Reorder the terms:
Y = -2(4 + x)(x + -5)

Reorder the terms:
Y = -2(4 + x)(-5 + x)

Multiply (4 + x) * (-5 + x)
Y = -2(4(-5 + x) + x(-5 + x))
Y = -2((-5 * 4 + x * 4) + x(-5 + x))
Y = -2((-20 + 4x) + x(-5 + x))
Y = -2(-20 + 4x + (-5 * x + x * x))
Y = -2(-20 + 4x + (-5x + x2))

Combine like terms: 4x + -5x = -1x
Y = -2(-20 + -1x + x2)
Y = (-20 * -2 + -1x * -2 + x2 * -2)
Y = (40 + 2x + -2x2)

Solving
Y = 40 + 2x + -2x2

Solving for variable 'Y'.

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

Simplifying
Y = 40 + 2x + -2x2

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