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5) Given [tex]f(x) = 2x - 1[/tex], find [tex]f^{-1}(3)[/tex].

A. 1
B. 2
C. 3
D. 4

Sagot :

GinnyAnswer
Certainly! Let's find the inverse function of [tex]\( f(x) = 2x - 1 \)[/tex] and evaluate it at 3.

1. Define the function:
[tex]\( f(x) = 2x - 1 \)[/tex]

2. Set [tex]\( y \)[/tex] to be equal to [tex]\( f(x) \)[/tex]:
[tex]\( y = 2x - 1 \)[/tex]

3. Solve for [tex]\( x \)[/tex] in terms of [tex]\( y \)[/tex]:
[tex]\[ y = 2x - 1 \][/tex]
[tex]\[ y + 1 = 2x \][/tex]
[tex]\[ x = \frac{y + 1}{2} \][/tex]
Therefore, the inverse function [tex]\( f^{-1}(y) \)[/tex] is:
[tex]\[ f^{-1}(y) = \frac{y + 1}{2} \][/tex]

4. Evaluate the inverse function at [tex]\( y = 3 \)[/tex]:
[tex]\[ f^{-1}(3) = \frac{3 + 1}{2} = \frac{4}{2} = 2 \][/tex]

Hence, [tex]\( f^{-1}(3) = 2 \)[/tex].

The correct answer is:
(B) 2
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