Questions: Write an equation for the inverse of the given one-to-one function.
f(x)=9-(x-8)^(1/3)
f^(-1)(x)= -x^3+27x^2-243x+737 (Do not multiply. Do not combine like terms.)
Transcript text: Write an equation for the inverse of the given one-to-one function.
\[
f(x)=9-\sqrt[3]{x-8}
\]
$f^{-1}(x)=$ $\square$ $-x^{3}+27 x^{2}-243 x+737$ (Do not multiply. Do not combine like terms.)
Solution
Solution Steps
To find the inverse of the given function \( f(x) = 9 - \sqrt[3]{x-8} \), we need to follow these steps:
Replace \( f(x) \) with \( y \).
Swap \( x \) and \( y \) to solve for \( y \) in terms of \( x \).
Isolate \( y \) to express the inverse function \( f^{-1}(x) \).
Step 1: Define the Original Function
Given the function:
\[ f(x) = 9 - \sqrt[3]{x - 8} \]
Step 2: Replace \( f(x) \) with \( y \)
\[ y = 9 - \sqrt[3]{x - 8} \]
Step 3: Swap \( x \) and \( y \)
\[ x = 9 - \sqrt[3]{y - 8} \]
Step 4: Isolate \( y \)
To isolate \( y \), we first move the constant term to the other side:
\[ \sqrt[3]{y - 8} = 9 - x \]
Next, we cube both sides to remove the cube root:
\[ y - 8 = (9 - x)^3 \]
Finally, we solve for \( y \):
\[ y = (9 - x)^3 + 8 \]