If f(x) = x^2 - 4x, what is f(5)?

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Prepare for the CCC Common Core Pre-Test with our comprehensive quiz. Utilize detailed flashcards and multiple-choice questions, each accompanied by insights and explanations, to enhance your readiness for the exam!

Multiple Choice

If f(x) = x^2 - 4x, what is f(5)?

Explanation:
Evaluating a function at a specific input means replacing the variable with that input and simplifying. So plug in x = 5 into f(x) = x^2 − 4x. Compute: 5^2 − 4(5) = 25 − 20 = 5. Therefore, f(5) equals 5. The other numbers wouldn’t come from this calculation, since they don’t match 25 − 20.

Evaluating a function at a specific input means replacing the variable with that input and simplifying. So plug in x = 5 into f(x) = x^2 − 4x.

Compute: 5^2 − 4(5) = 25 − 20 = 5.

Therefore, f(5) equals 5. The other numbers wouldn’t come from this calculation, since they don’t match 25 − 20.

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