y=-.1(x-40)2+100

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Solution for y=-.1(x-40)2+100 equation: 


Simplifying
y = -0.1(x + -40) * 2 + 100

Reorder the terms:
y = -0.1(-40 + x) * 2 + 100

Reorder the terms for easier multiplication:
y = -0.1 * 2(-40 + x) + 100

Multiply -0.1 * 2
y = -0.2(-40 + x) + 100
y = (-40 * -0.2 + x * -0.2) + 100
y = (8 + -0.2x) + 100

Reorder the terms:
y = 8 + 100 + -0.2x

Combine like terms: 8 + 100 = 108
y = 108 + -0.2x

Solving
y = 108 + -0.2x

Solving for variable 'y'.

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

Simplifying
y = 108 + -0.2x

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