If f of x is equal to square root of x plus 12 and g of x is equal to 2 square root of x , what is the value of open paren f minus g close paren of 144 ?
Answer
A
negative 84
B
0
C
negative 60
D
48
Explanation
Substitute 144 into each function. Since √144 = 12, f(144) = 12 + 12 = 24 and g(144) = 2(12) = 24. Therefore, (f − g)(144) = 24 − 24 = 0, so the correct choice is 0.
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