If f(x) = 3x+2, find f(f^-1(14))? a) 44 b) 176 c) 4 d) 14

asked Apr 17, 2019 150k views

5 votes

If f(x) = 3x+2, find f(f^-1(14))?

a) 44

b) 176

c) 4

d) 14

by NXT

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2 votes

$f(x)=3x+2\\\\y=3x+2\ \ \ |-2\\\\3x=y-2\ \ \ \ |:3\\\\x=(y-2)/(3)\to f^(-1)(x)=(x-2)/(3)$

f^(-1)(14)=(14-2)/(3)=(12)/(3)=4

$f(f^(-1)(14))=3\cdot4+2=12+2=14$

Answer: d) 14

Jjwchoy answered Apr 22, 2019

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