Question

For f(x)= 5 over x-7 when will. f(x) equal 8?

Answer 1

Therefore at

`x=(1)/(3)`

we have

`f(x)=8`

Explanation:

Given:

`f(x)=(5)/(x)-7`

To Find:

x = ? when f(x) = 8

Solution:

`f(x)=(5)/(x)-7` ..............Given

Substituting f(x) = 8 we get

`8=(5)/(x)-7`

Adding 7 to both the side

`8+7=(5)/(x)-7+7`

`15=(5)/(x)`

`x=(5)/(15)=(1)/(3)`

Therefore at

`x=(1)/(3)`

we have

`f(x)=8`