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3 years ago

If f (x) =5x+40 what is f (x) when x =-5

Mathematics

2 answers:

spayn [35]3 years ago

5 0

F(x)= 15 because 5 times -5 is -25 and -25+40 is 15

Darya [45]3 years ago

4 0

Answer: 15

Step-by-step explanation:

Given function: $\text{f(x)}=5x+40$

To find $\text{f(x)}$ when x=-5, we need to substitute the value of x in the given function, then we get

$\text{f(-5)}=5(-5)+40$

Simplify:

$\Rightarrow\text{f(-5)}=-25+40=40-25$

$\Rightarrow\text{f(-5)}=15$

Therefore, when x=-5, then the value of f(x)=15.

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Step-by-step explanation:

Given

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