Question

Consider the function f(x) = 5x - 2.If f(x) = -22, what is x? What point is on the graph of f?

Answer 1

Having the expression for f(x), and knowing the value of f(x) (-22), we just need to equate those expressions:

`f(x)=5x-2=-22`

Obtaining the following equation with one unknown:

`5x-2=-22`

Solving for x:

`\begin{gathered} 5x=-22+2 \\ \\ 5x=-20 \\ \\ x=-(20)/(5) \\ \\ x=-4 \end{gathered}`

Answer B: when f(x) = -22, we have that x = -4.

And this will correspond to the point (-4,- 22)