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1 solution
Turn this equation into something like this: F ( x ) = √ ( 1 + x ) √ ( 1 + ( x + 1 ) ) Then, square both sides. F ( x ) s q u a r e d = 1 + x F ( x + 1 ) This will give solution: F ( x ) = x + 1 Setting Function x = 2 gives 3.