If f(x) = 4x - 1, what is f(21)?

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Multiple Choice

If f(x) = 4x - 1, what is f(21)?

Explanation:
Evaluating a function means replacing the input with the given value and simplifying. For f(x) = 4x − 1, plug in x = 21: f(21) = 4(21) − 1. Compute 4 × 21 = 84, then subtract 1 to get 83. So f(21) equals 83. Among the options, the one that lists 83 is the correct choice.

Evaluating a function means replacing the input with the given value and simplifying. For f(x) = 4x − 1, plug in x = 21: f(21) = 4(21) − 1. Compute 4 × 21 = 84, then subtract 1 to get 83. So f(21) equals 83. Among the options, the one that lists 83 is the correct choice.

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