How would I solve for A, B and C?

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I have managed to write the equation in the non-simplified form but my attempts to simplify it lead me to a fraction that is not in the required form.

Any help?

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${f(x+h)-f(x) \over h} = 3 { \sqrt{x}-\sqrt{x+h} \over h} = 3 { \sqrt{x}-\sqrt{x+h} \over h} {\sqrt{x}+\sqrt{x+h} \over \sqrt{x}+\sqrt{x+h}}$. Now simplify.