f(3)=-x^2+2x-9

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Solution for f(3)=-x^2+2x-9 equation: 


Simplifying
f(3) = -1x2 + 2x + -9

Reorder the terms for easier multiplication:
3f = -1x2 + 2x + -9

Reorder the terms:
3f = -9 + 2x + -1x2

Solving
3f = -9 + 2x + -1x2

Solving for variable 'f'.

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

Divide each side by '3'.
f = -3 + 0.6666666667x + -0.3333333333x2

Simplifying
f = -3 + 0.6666666667x + -0.3333333333x2

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