9
Answer: BSet 2: Function Notation (Advanced)
Explanation
PROBLEM
If f(x) = 2x - 1, find x when f(x) = 15.
If f(x) = 2x - 1, find x when f(x) = 15.
A.
11
B.✓ Correct
8
C.
9
D.
10
Detailed Explanation
Choice B is the best answer. 2x - 1 = 15. 2x = 16. x = 8
Why others are wrong:
A: 11 is incorrect because it does not satisfy the equation.
C: 9 is incorrect because it does not satisfy the equation.
D: 10 is incorrect because it does not satisfy the equation.