3
Answer: DSet 4: Function Notation (Intermediate)
Explanation
PROBLEM
If f(x) = 5x - 3, find x when f(x) = 42.
If f(x) = 5x - 3, find x when f(x) = 42.
A.
6
B.
10
C.
12
D.✓ Correct
9
Detailed Explanation
Choice D is the best answer. 5x - 3 = 42. 5x = 45. x = 9
Why others are wrong:
A: 6 is incorrect because it does not satisfy the equation.
B: 10 is incorrect because it does not satisfy the equation.
C: 12 is incorrect because it does not satisfy the equation.