tatixx
tatixx tatixx
  • 21-08-2017
  • Mathematics
contestada

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

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joyajoya3
joyajoya3 joyajoya3
  • 21-08-2017
f(x)= 15 because 5 times -5 is -25 and -25+40 is 15
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JeanaShupp
JeanaShupp JeanaShupp
  • 22-03-2019

Answer: 15

Step-by-step explanation:

Given function: [tex]\text{f(x)}=5x+40[/tex]

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

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

Simplify:

[tex]\Rightarrow\text{f(-5)}=-25+40=40-25[/tex]

[tex]\Rightarrow\text{f(-5)}=15[/tex]

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

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