Given that the function f (x) = x + B (a is greater than 0, a is not equal to 1) satisfies f (x + y) = f (x) f (y) and f (3) = 8 to find f (x)

F (x + y) = f (x) f (y) to get b = 0, from F (3) = 8 to get a = 2, so f (x) = the x power of 2

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