Given:
The function is
[tex]f(x)=4x-8[/tex]
To find:
The input of the function when the output is 20.
Solution:
We have,
[tex]f(x)=4x-8[/tex]
Here, x is input and f(x) is output.
Put f(x)=20 in the given function to find the input of the function when the output is 20.
[tex]20=4x-8[/tex]
[tex]20+8=4x[/tex]
[tex]28=4x[/tex]
Divide both sides by 4.
[tex]\dfrac{28}{4}=x[/tex]
[tex]7=x[/tex]
Therefore, the required input value is 7.
