f(-1)f(x)=-2x

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


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

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

Multiply f * f
-1f2 * x = -2x

Multiply f2 * x
-1f2x = -2x

Solving
-1f2x = -2x

Solving for variable 'f'.

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

Divide each side by '-1x'.
f2 = 2

Simplifying
f2 = 2

Take the square root of each side:
f = {-1.414213562, 1.414213562}

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