y=-0.5(x-3)(x-15)

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Solution for y=-0.5(x-3)(x-15) equation: 


Simplifying
y = -0.5(x + -3)(x + -15)

Reorder the terms:
y = -0.5(-3 + x)(x + -15)

Reorder the terms:
y = -0.5(-3 + x)(-15 + x)

Multiply (-3 + x) * (-15 + x)
y = -0.5(-3(-15 + x) + x(-15 + x))
y = -0.5((-15 * -3 + x * -3) + x(-15 + x))
y = -0.5((45 + -3x) + x(-15 + x))
y = -0.5(45 + -3x + (-15 * x + x * x))
y = -0.5(45 + -3x + (-15x + x2))

Combine like terms: -3x + -15x = -18x
y = -0.5(45 + -18x + x2)
y = (45 * -0.5 + -18x * -0.5 + x2 * -0.5)
y = (-22.5 + 9x + -0.5x2)

Solving
y = -22.5 + 9x + -0.5x2

Solving for variable 'y'.

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

Simplifying
y = -22.5 + 9x + -0.5x2

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