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

asked Apr 24, 2017 86.5k views

2 votes

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

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4 votes

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

Explanation:

MapTiler answered Apr 27, 2017

7.3k points

4 votes

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

Leann answered Apr 28, 2017

by Leann

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