Question

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

Answer 1

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

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

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

$\large\orange\implies \rm \large \: \cancel\frac{8}{2} \: = \: x$

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

• The value of x is 4 when f(x) is 8

Answer 2

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

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

$8 = \: 2x$

$x = \frac{8}{2} \\ \\ x = 1.$

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