Problem

1. Practice similar Help me with this Find a formula for $f^{-1}(x)$ and $\left(f^{-1}\right)^{\prime}(x)$ if $f(x)=-\sqrt{6-x}$ \[ \begin{array}{l} f^{-1}(x)= \\ \left(f^{-1}\right)^{\prime}(x)= \end{array} \] Submit answer

Solution

Step 1 :Replace the function notation with y: \(y = -\sqrt{6 - x}\)

Step 2 :Swap x and y: \(x = -\sqrt{6 - y}\)

Step 3 :Square both sides to get rid of the square root: \(x^2 = -(6 - y)\)

Step 4 :Multiply both sides by -1 to get rid of the negative sign: \(-x^2 = 6 - y\)

Step 5 :Solve for y to get the inverse function: \(y = 6 + x^2\)

Step 6 :\(\boxed{f^{-1}(x) = 6 + x^2}\) is the inverse function

Step 7 :Use the power rule for derivatives to find the derivative of the inverse function: \((f^{-1})'(x) = 2x\)

Step 8 :\(\boxed{(f^{-1})'(x) = 2x}\) is the derivative of the inverse function

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