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Question 2:

Given [tex]\( f(x) = 5 \)[/tex] when [tex]\( x \leq 2 \)[/tex] and [tex]\( f(x) = 2x - 3 \)[/tex] when [tex]\( x \ \textgreater \ 2 \)[/tex], evaluate [tex]\( f(5) \)[/tex].

A) -13


Sagot :

To determine the value of [tex]\( f(5) \)[/tex] for the given function [tex]\( f(x) \)[/tex], we need to carefully consider the conditions specified in the piecewise function definition.

The function [tex]\( f(x) \)[/tex] is defined as follows:
- [tex]\( f(x) = 5 \)[/tex] when [tex]\( x \leq 2 \)[/tex]
- [tex]\( f(x) = 2x - 3 \)[/tex] when [tex]\( x > 2 \)[/tex]

Given [tex]\( x = 5 \)[/tex], we need to determine which condition applies.

1. First, check the condition [tex]\( x \leq 2 \)[/tex]:
- Since [tex]\( 5 \)[/tex] is not less than or equal to [tex]\( 2 \)[/tex], we do not use [tex]\( f(x) = 5 \)[/tex].

2. Next, check the condition [tex]\( x > 2 \)[/tex]:
- Since [tex]\( 5 \)[/tex] is greater than [tex]\( 2 \)[/tex], we will use [tex]\( f(x) = 2x - 3 \)[/tex].

Now, substitute [tex]\( x = 5 \)[/tex] into the equation [tex]\( f(x) = 2x - 3 \)[/tex] to evaluate [tex]\( f(5) \)[/tex]:

[tex]\[ f(5) = 2(5) - 3 \][/tex]

Calculate the value:

[tex]\[ f(5) = 10 - 3 = 7 \][/tex]

Therefore, [tex]\( f(5) \)[/tex] is [tex]\( 7 \)[/tex].

So, the value of [tex]\( f(5) \)[/tex] is [tex]\( 7 \)[/tex].