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If [tex]\( f(x) = 5x + 40 \)[/tex], what is [tex]\( f(x) \)[/tex] when [tex]\( x = -5 \)[/tex]?

A. -9
B. -8
C. 7
D. 15


Sagot :

To solve for [tex]\( f(x) \)[/tex] when [tex]\( x = -5 \)[/tex] given the function [tex]\( f(x) = 5x + 40 \)[/tex], follow these steps:

1. Substitute [tex]\( x = -5 \)[/tex] into the function [tex]\( f(x) \)[/tex].

[tex]\[ f(-5) = 5(-5) + 40 \][/tex]

2. Perform the multiplication inside the parenthesis.

[tex]\[ 5 \times (-5) = -25 \][/tex]

3. Add the result to 40.

[tex]\[ -25 + 40 = 15 \][/tex]

Therefore, [tex]\( f(-5) = 15 \)[/tex].

The correct answer is [tex]\( 15 \)[/tex].