Question

If m(x) = 3(x + 4) – 2 and m (x) = 28 what is x?

Answer 1

Given the function:

$m(x)=3(x+4)-2$

if we have that m(x)=28, then:

$\begin{gathered} m(x)=28 \\ \Rightarrow28=3(x+4)-2 \\ \Rightarrow28=3x+12-2 \\ \Rightarrow28=3x+10 \\ \Rightarrow28-10=3x \\ \Rightarrow18=3x \\ \Rightarrow x=\frac{18}{3}=6 \\ x=6 \end{gathered}$

therefore, if m(x)=28, then x=6