y=-0.5(x+13)(x+8)

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Solution for y=-0.5(x+13)(x+8) equation: 


Simplifying
y = -0.5(x + 13)(x + 8)

Reorder the terms:
y = -0.5(13 + x)(x + 8)

Reorder the terms:
y = -0.5(13 + x)(8 + x)

Multiply (13 + x) * (8 + x)
y = -0.5(13(8 + x) + x(8 + x))
y = -0.5((8 * 13 + x * 13) + x(8 + x))
y = -0.5((104 + 13x) + x(8 + x))
y = -0.5(104 + 13x + (8 * x + x * x))
y = -0.5(104 + 13x + (8x + x2))

Combine like terms: 13x + 8x = 21x
y = -0.5(104 + 21x + x2)
y = (104 * -0.5 + 21x * -0.5 + x2 * -0.5)
y = (-52 + -10.5x + -0.5x2)

Solving
y = -52 + -10.5x + -0.5x2

Solving for variable 'y'.

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

Simplifying
y = -52 + -10.5x + -0.5x2

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