Question

Find the value of x so that function has the given value.

Answer 1

$\begin{gathered} (b) \\ m(x)=4x+15 \\ \text{Here}\Rightarrow m(x)=7 \\ So, \\ 7=4x-15 \\ 4x=15+7 \\ 4x=22 \\ x=\frac{22}{4} \\ x=\frac{11}{2} \\ x=5.5 \end{gathered}$