Advanced MathEasy–MediumDifference of two values of a square-root function
Advanced Math practice question
The function h is defined by h(x) = √(2x + 1). What is the value of h(12) − h(4)?
Answer: 2
h(12) = √25 = 5 and h(4) = √9 = 3, so the difference is 2.
Common wrong answers
- If you answered 4
- 4 is √16, taking the root of the difference 25 − 9.
- If you answered 5
- 5 is h(12) alone.
- If you answered 8
- 8 is 12 − 4, the difference of the inputs.
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