If f(x) = 3x + 5, what is f(4)?

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Multiple Choice

If f(x) = 3x + 5, what is f(4)?

Explanation:
Evaluating a function means plugging the input value into the expression and simplifying. For f(x) = 3x + 5, f(4) means replace x with 4: f(4) = 3(4) + 5. Compute 3 times 4 to get 12, then add 5 to get 17. So the result is 17. The other numbers come from common missteps: forgetting the +5 gives 12; using x = 5 or a mistaken substitution can yield 15; adding 10 instead of 5 would give 22.

Evaluating a function means plugging the input value into the expression and simplifying. For f(x) = 3x + 5, f(4) means replace x with 4: f(4) = 3(4) + 5. Compute 3 times 4 to get 12, then add 5 to get 17. So the result is 17. The other numbers come from common missteps: forgetting the +5 gives 12; using x = 5 or a mistaken substitution can yield 15; adding 10 instead of 5 would give 22.

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