a) \(f\left(0\right)=\left|0\right|=0\)
\(f\left(\dfrac{3}{2}\right)=\left|\dfrac{3}{2}\right|=\dfrac{3}{2}\)
\(f\left(7\right)=\left|7\right|=7\)
\(f\left(-1\right)=\left|-1\right|=1\)
\(f\left(-5\right)=\left|-5\right|=5\)
b) \(f\left(x\right)=2\Rightarrow\left|x\right|=2\Rightarrow x=\left\{-2;2\right\}\)