2
Answer: DSet 5: Function Notation (Intermediate)
Explanation
PROBLEM
If f(x) = 2x + 1, find x when f(x) = 13.
If f(x) = 2x + 1, find x when f(x) = 13.
A.
3
B.
7
C.
4
D.✓ Correct
6
Detailed Explanation
Choice D is the best answer. 2x + 1 = 13. 2x = 12. x = 6
Why others are wrong:
A: 3 is incorrect because it does not satisfy the equation.
B: 7 is incorrect because it does not satisfy the equation.
C: 4 is incorrect because it does not satisfy the equation.