Question

Given f(x)=−x−5, solve for x when f(x)=4.
a) x=−1
b) x=1
c) x=−9
d) x=9

Answer 1

To find the value of x given f(x)=4 for the function f(x)=-x-5, you solve the equation 4=-x-5, which simplifies to x=-9.

Step-by-step explanation:

To olve for x when f(x)=4 given the function f(x) = -x - 5, set the function equal to 4:

4 = -x - 5

Then, add 5 to both sides of the equation to isolate the term containing x:

4 + 5 = -xs

9 = -x

Finally, multiply both sides by -1 to get the value of x:

-9 = x

The correct answer is x = -9, which corresponds to option c.