y=-0.05(x-20)(x-40)

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Solution for y=-0.05(x-20)(x-40) equation: 


Simplifying
y = -0.05(x + -20)(x + -40)

Reorder the terms:
y = -0.05(-20 + x)(x + -40)

Reorder the terms:
y = -0.05(-20 + x)(-40 + x)

Multiply (-20 + x) * (-40 + x)
y = -0.05(-20(-40 + x) + x(-40 + x))
y = -0.05((-40 * -20 + x * -20) + x(-40 + x))
y = -0.05((800 + -20x) + x(-40 + x))
y = -0.05(800 + -20x + (-40 * x + x * x))
y = -0.05(800 + -20x + (-40x + x2))

Combine like terms: -20x + -40x = -60x
y = -0.05(800 + -60x + x2)
y = (800 * -0.05 + -60x * -0.05 + x2 * -0.05)
y = (-40 + 3x + -0.05x2)

Solving
y = -40 + 3x + -0.05x2

Solving for variable 'y'.

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

Simplifying
y = -40 + 3x + -0.05x2

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