f(x+y)-f(x-y)=5xy+2y

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Solution for f(x+y)-f(x-y)=5xy+2y equation:


Simplifying
f(x + y) + -1f(x + -1y) = 5xy + 2y
(x * f + y * f) + -1f(x + -1y) = 5xy + 2y
(fx + fy) + -1f(x + -1y) = 5xy + 2y
fx + fy + (x * -1f + -1y * -1f) = 5xy + 2y
fx + fy + (-1fx + 1fy) = 5xy + 2y

Reorder the terms:
fx + -1fx + fy + 1fy = 5xy + 2y

Combine like terms: fx + -1fx = 0
0 + fy + 1fy = 5xy + 2y
fy + 1fy = 5xy + 2y

Combine like terms: fy + 1fy = 2fy
2fy = 5xy + 2y

Solving
2fy = 5xy + 2y

Solving for variable 'f'.

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

Divide each side by '2y'.
f = 2.5x + 1

Simplifying
f = 2.5x + 1

Reorder the terms:
f = 1 + 2.5x

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