The function given is
[tex]f(x)=15-3x[/tex]
We were asked to find all real values of x such that
[tex]f(x)=0[/tex]
Therefore,
We will equate both values of f(x) together to get
[tex]15-3x=0[/tex]
Subtract 15 from both sides
[tex]\begin{gathered} 15-15-3x=0-15 \\ -3x=-15 \\ \text{divide both sides by -3,} \\ \frac{-3x}{-3}=\frac{-15}{-3} \\ x=5 \end{gathered}[/tex]
Therefore,
The value of x = 5
