Question

If f(7) = 18, then how do you complete f(x) = 2x + _____?

Answer 1

`f(x)=2x+4`

Explanation:

`f(7)=18` `" "color(red)((1))`

Let

`f(x)=2x+B`

Where B is the value to be determined.

Replace `x` by 7 in above equation.

`f(7)=2(7)+B`

`f(7)=14+B`

But we know that `f(7)=18`,

`18=14+B`

`B=18-14`

`B=4`