f(2i)=x^2+x-4

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


Simplifying
f(2i) = x2 + x + -4

Remove parenthesis around (2i)
f * 2i = x2 + x + -4

Reorder the terms for easier multiplication:
2f * i = x2 + x + -4

Multiply f * i
2fi = x2 + x + -4

Reorder the terms:
2fi = -4 + x + x2

Solving
2fi = -4 + x + x2

Solving for variable 'f'.

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

Divide each side by '2i'.
f = -2i-1 + 0.5i-1x + 0.5i-1x2

Simplifying
f = -2i-1 + 0.5i-1x + 0.5i-1x2

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