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Given the function [tex]\( f(x) = \frac{x-7}{5} \)[/tex], find [tex]\( f^{-1}(x) \)[/tex].

Sagot :

GinnyAnswer
To find the inverse function [tex]\( f^{-1}(x) \)[/tex] for the function [tex]\( f(x) = \frac{x-7}{5} \)[/tex], follow these detailed steps:

1. Start with the original function:
[tex]\[ y = f(x) = \frac{x-7}{5} \][/tex]

2. Interchange the roles of [tex]\( x \)[/tex] and [tex]\( y \)[/tex]:
[tex]\[ x = \frac{y-7}{5} \][/tex]

3. Solve the new equation for [tex]\( y \)[/tex]:

- Multiply both sides by 5 to get rid of the denominator:
[tex]\[ 5x = y - 7 \][/tex]
- Add 7 to both sides to isolate [tex]\( y \)[/tex]:
[tex]\[ y = 5x + 7 \][/tex]

4. Thus, the inverse function is:
[tex]\[ f^{-1}(x) = 5x + 7 \][/tex]

So the inverse function [tex]\( f^{-1}(x) \)[/tex] is [tex]\( 5x + 7 \)[/tex].
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