Question

The graph shows the function f(x) =2*x what is the value of x when f(x)=8

Answer 1

x=4

Explanation:

since f(x )=8

8=2*x

we divide by 2 both side

so,

x=4

Answer 2

f(x)= 2ˣ

We have to find x when f(x) is 8

8=2ˣ

we can write 8 in exponential form as 2³

2³=2ˣ

here base is same (2) on both left and right side

comparing the powers we get

x=3

:)