f(x)f(y)=f(x+y)+xy

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Solution for f(x)f(y)=f(x+y)+xy equation:


Simplifying
f(x) * f(y) = f(x + y) + xy

Multiply f * x
fx * f * y = f(x + y) + xy

Multiply fx * f
f2x * y = f(x + y) + xy

Multiply f2x * y
f2xy = f(x + y) + xy
f2xy = (x * f + y * f) + xy
f2xy = (fx + fy) + xy

Solving
f2xy = fx + fy + xy

Solving for variable 'f'.

Reorder the terms:
-1fx + -1fy + f2xy + -1xy = fx + fy + xy + -1fx + -1fy + -1xy

Reorder the terms:
-1fx + -1fy + f2xy + -1xy = fx + -1fx + fy + -1fy + xy + -1xy

Combine like terms: fx + -1fx = 0
-1fx + -1fy + f2xy + -1xy = 0 + fy + -1fy + xy + -1xy
-1fx + -1fy + f2xy + -1xy = fy + -1fy + xy + -1xy

Combine like terms: fy + -1fy = 0
-1fx + -1fy + f2xy + -1xy = 0 + xy + -1xy
-1fx + -1fy + f2xy + -1xy = xy + -1xy

Combine like terms: xy + -1xy = 0
-1fx + -1fy + f2xy + -1xy = 0

The solution to this equation could not be determined.

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