Discussion

Explanation:

Given, f(x) = 2x + 3.

∴ f(f(x)) = 2 × (2x + 3) + 3 = 4x + 6 + 3 = 4x + 9.

⇒ f(f(2)) = 4 × x + 9 = 17.

Hence, 17.

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