Question

The graph shows the function f(x) = 2x.
What is the value of x when f(x) = 8?

Answer 1

`f(x) \: = \: 2x`

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

`8 = \: 2x`

`x = (8)/(2) \\ \\ x = 1.`

The value of x is 4 when f(x) is 8 .

Answer 2

`\large\orange\implies \rm \large \:f(x) \: = \: 2x`

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

`\large\orange\implies \rm \large \:8 = \: 2x`

`\large\orange\implies \rm \large \: \cancel(8)/(2) \: = \: x \\`

`\large\orange\implies \rm \large \: \: 4 \: = \: x`

• The value of x is 4 when f(x) is 8