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

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

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
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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