Question

If f(x) varies directly with x2, and f(x) = 96 when x = 4, find the value of f(2).

A.192
B.72
C.32
D.24

Answer 1

Answer: I just took the test and the answer was 24.

Explanation:

Answer 2

f ( x ) = k * x²
f ( 4 ) = 96
96 = k * 4²
96 = 16 k
k = 96 : 16
k = 6
f ( 2 ) = 6 * 2² = 6 * 4 = 24
Answer: D ) 24