f(x)=x^2+10x+21

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Solution for f(x)=x^2+10x+21 equation: 


Simplifying
f(x) = x2 + 10x + 21

Multiply f * x
fx = x2 + 10x + 21

Reorder the terms:
fx = 21 + 10x + x2

Solving
fx = 21 + 10x + x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 21x-1 + 10 + x

Simplifying
f = 21x-1 + 10 + x

Reorder the terms:
f = 10 + 21x-1 + x

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