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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 :

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

1. Substitute [tex]\( x \)[/tex] with -5 in the function: Given [tex]\( f(x) = 5x + 40 \)[/tex], we substitute [tex]\( x = -5 \)[/tex].

2. Perform the multiplication first: Calculate [tex]\( 5 \times (-5) \)[/tex].
[tex]\[ 5 \times (-5) = -25 \][/tex]

3. Add 40 to the result of the multiplication:
[tex]\[ -25 + 40 = 15 \][/tex]

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

Therefore, the value of [tex]\( f(x) \)[/tex] when [tex]\( x = -5 \)[/tex] is:

- 15
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