f(21)=x^2+4x-11

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Solution for f(21)=x^2+4x-11 equation: 


Simplifying
f(21) = x2 + 4x + -11

Reorder the terms for easier multiplication:
21f = x2 + 4x + -11

Reorder the terms:
21f = -11 + 4x + x2

Solving
21f = -11 + 4x + x2

Solving for variable 'f'.

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

Divide each side by '21'.
f = -0.5238095238 + 0.1904761905x + 0.04761904762x2

Simplifying
f = -0.5238095238 + 0.1904761905x + 0.04761904762x2

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