Question

F(×) = 9x + 54 find x when f (×) = 18

Answer 1

The given expression is

`f(x)=9x+54`

The expression f(x) = 18 means that we have to evaluate the function f(x) when y = 18. Let's replace this value and solve for x.

`\begin{gathered} 8=9x+54 \\ 18-54=9x \\ x=(-36)/(9)=-4 \end{gathered}`

Hence, the solution is x = -4.