10
Answer: DSet 2: Function Notation (Intermediate)
Explanation
PROBLEM
If f(x) = 2x + 1, find x when f(x) = 23.
If f(x) = 2x + 1, find x when f(x) = 23.
A.
13
B.
10
C.
14
D.✓ Correct
11
Detailed Explanation
Choice D is the best answer. 2x + 1 = 23. 2x = 22. x = 11
Why others are wrong:
A: 13 is incorrect because it does not satisfy the equation.
B: 10 is incorrect because it does not satisfy the equation.
C: 14 is incorrect because it does not satisfy the equation.
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