Question

Given the function f(x) = 6(x+2) − 3, solve for the inverse function when x = 21.

Answer 1

\[f(x)=6x+12-3\]
\[f(x)=6x-9\]
\[f(x)=y\]
\[y=6x-9\]
\[f \prime(x) :x=6y-9\]
\[\frac{ x+9 }{ 6 }=\frac{ 6y }{ 6 }\]
\[y=\frac{ x+9 }{ 6 }\]
\[f \prime(x)=\frac{ x+9 }{ 6 }\]
\[f \prime(21)=\frac{ 21+9 }{ 6 }=5\]

Answer 2

Hope i helped you