What is f(3) given f(x) = 2x + 3?

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Evaluating a function at a specific input means substituting that input into the function’s rule. For f(x) = 2x + 3, plug in x = 3: f(3) = 2(3) + 3. Multiply first: 2 × 3 = 6, then add 3 to get 9. So f(3) equals 9.