Search 75,100 tutors
FIND TUTORS
Ask a question
0 0

f(x)=6(x+2)-3 solve for the inverse function when x=21

Tutors, please sign in to answer this question.

1 Answer

Hi Michele;
f(x)=6(x+2)-3
y=6x+12-3
y=6x+9
f(x)=f(21)=y
y=6(21)+9
y=126+9=135
 
y=6x+9
y-9=6x
(y-9)/6=x
x=(y-9)/6
f-1(x)=f-1(135)=x
x=(y-9)/6
x=(135-9)/6
x=126/6=21