f(-7)=x*x+2x+1

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Solution for f(-7)=x*x+2x+1 equation: 


Simplifying
f(-7) = x * x + 2x + 1

Reorder the terms for easier multiplication:
-7f = x * x + 2x + 1

Multiply x * x
-7f = x2 + 2x + 1

Reorder the terms:
-7f = 1 + 2x + x2

Solving
-7f = 1 + 2x + x2

Solving for variable 'f'.

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

Divide each side by '-7'.
f = -0.1428571429 + -0.2857142857x + -0.1428571429x2

Simplifying
f = -0.1428571429 + -0.2857142857x + -0.1428571429x2

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