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Given [tex]$f(x)=10-2x$[/tex], find [tex]$f(7)$[/tex].

A. [tex]-4[/tex]
B. [tex]3[/tex]
C. [tex]7[/tex]
D. [tex]56[/tex]


Sagot :

To solve the problem of finding [tex]\( f(7) \)[/tex] given the function [tex]\( f(x) = 10 - 2x \)[/tex], let's go through the steps:

1. Start with the given function:
[tex]\[ f(x) = 10 - 2x \][/tex]

2. Substitute [tex]\( x = 7 \)[/tex] into the function:
[tex]\[ f(7) = 10 - 2(7) \][/tex]

3. Perform the multiplication inside the parentheses first:
[tex]\[ 2 \times 7 = 14 \][/tex]

4. Substitute this value back into the equation:
[tex]\[ f(7) = 10 - 14 \][/tex]

5. Complete the subtraction:
[tex]\[ 10 - 14 = -4 \][/tex]

So, the value of [tex]\( f(7) \)[/tex] is [tex]\( -4 \)[/tex].

Thus, the correct answer is:
[tex]\[ -4 \][/tex]