If f(x) = 3x + 1, what is f(5)?

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Multiple Choice

If f(x) = 3x + 1, what is f(5)?

Explanation:
Evaluating a function at a specific input means substituting that input into the expression. For f(x) = 3x + 1, replace x with 5: f(5) = 3(5) + 1. Multiply first: 3 × 5 = 15, then add 1 to get 16. So f(5) = 16. A common mix-up is treating it as 3(5 + 1) = 18, but substitution uses x only, not x + 1 inside the parentheses.

Evaluating a function at a specific input means substituting that input into the expression. For f(x) = 3x + 1, replace x with 5: f(5) = 3(5) + 1. Multiply first: 3 × 5 = 15, then add 1 to get 16. So f(5) = 16. A common mix-up is treating it as 3(5 + 1) = 18, but substitution uses x only, not x + 1 inside the parentheses.

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