Pope Reyes
07/11/2023 · Primary School

Find the inverse for each of the following functions. \( s(x)=3 x+3 \) \( s^{-1}(x)=\square \) \( r(x)=\sqrt[3]{8 x+5} \) \( r^{-1}(x)=\square \) \( h(x)=9 x^{3}+4 \) \( h^{-1}(x)=\square \) \( k(x)=\frac{5}{x+10} \) \( k^{-1}(x)=\square \)

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Step-by-step Solution

To find the inverse of a function, we need to switch the roles of x and y and solve for y. Let's go through each function one by one. 1. For \( s(x) = 3x + 3 \): Switch x and y: \[ x = 3y + 3 \] Solve for y: \[ x - 3 = 3y \] \[ y = \frac{x - 3}{3} \] So, \( s^{-1}(x) = \frac{x - 3}{3} \). 2. For \( r(x) = \sqrt[3]{8x + 5} \): Switch x and y: \[ x = \sqrt[3]{8y + 5} \] Cube both sides to eliminate the cube root: \[ x^3 = 8y + 5 \] Solve for y: \[ 8y = x^3 - 5 \] \[ y = \frac{x^3 - 5}{8} \] So, \( r^{-1}(x) = \frac{x^3 - 5}{8} \). 3. For \( h(x) = 9x^3 + 4 \): Switch x and y: \[ x = 9y^3 + 4 \] Solve for y: \[ 9y^3 = x - 4 \] \[ y^3 = \frac{x - 4}{9} \] Take the cube root of both sides: \[ y = \sqrt[3]{\frac{x - 4}{9}} \] So, \( h^{-1}(x) = \sqrt[3]{\frac{x - 4}{9}} \). 4. For \( k(x) = \frac{5}{x + 10} \): Switch x and y: \[ x = \frac{5}{y + 10} \] Solve for y: \[ x(y + 10) = 5 \] \[ xy + 10x = 5 \] \[ xy = 5 - 10x \] \[ y = \frac{5 - 10x}{x} \] \[ y = \frac{5}{x} - 10 \] So, \( k^{-1}(x) = \frac{5}{x} - 10 \). These are the inverses of the given functions.

Quick Answer

1. \( s^{-1}(x) = \frac{x - 3}{3} \) 2. \( r^{-1}(x) = \frac{x^3 - 5}{8} \) 3. \( h^{-1}(x) = \sqrt[3]{\frac{x - 4}{9}} \) 4. \( k^{-1}(x) = \frac{5}{x} - 10 \)
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