Advanced Math practice question

Answer: 3

The domain x ≥ 3 means x − a ≥ 0 exactly when x ≥ 3, so a = 3. Then h(12) = √(12 − 3) = √9 = 3.

Common wrong answers

If you answered 2

2 is h(7).

If you answered 9

9 is 12 − 3, before taking the square root.

If you answered 3.46

3.46 is √12, ignoring a.

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