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Given f (x) = -2x -5, find f (-1)

User Eddymage
by
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2 Answers

4 votes

To find
f(-1) given the function
f(x)=-2x-5, you simply substitute
-1 for
x in the function:


f(-1) = -2(-1)-5

Simplify:


f(-1) =2-5=-3

So,
f(-1) =-3

User Sofien Rahmouni
by
8.1k points
4 votes

Answer: f(-1) = -3

Explanation:

In order to evaluate this function, I am going to plug in -1 for x:


\bigstar\quad\sf{f(x)=-2x-5}


\bigstar\quad\sf{f(-1)=-2(-1)-5}


\bigstar\quad\sf{f(-1)=2-5}


\bigstar\quad\sf{f(-1)=-3}

Therefore, f(-1) = -3.

User Julien Berthoud
by
7.3k points

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