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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