f(x)=-0.1xsquared+0.8x+8.5

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Solution for f(x)=-0.1xsquared+0.8x+8.5 equation: 


Simplifying
f(x) = -0.1xsquared + 0.8x + 8.5

Multiply f * x
fx = -0.1xsquared + 0.8x + 8.5

Reorder the terms:
fx = 8.5 + -0.1adeqrsux + 0.8x

Solving
fx = 8.5 + -0.1adeqrsux + 0.8x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 8.5x-1 + -0.1adeqrsu + 0.8

Simplifying
f = 8.5x-1 + -0.1adeqrsu + 0.8

Reorder the terms:
f = 0.8 + -0.1adeqrsu + 8.5x-1

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