\(y=f\left(x\right)=-2x+3\)
\(y=f\left(-2\right)=\left(-2\right)\left(-2\right)+3=4+3=7\)
\(y=f\left(-1\right)=\left(-2\right)\left(-1\right)+3=2+3=5\)
\(y=f\left(0\right)=-2.0+3=0+3=3\)
\(y=f\left(\dfrac{-1}{2}\right)=-2.\left(\dfrac{-1}{2}\right)+3=1+3=4\)
\(y=f\left(\dfrac{1}{2}\right)=-2\left(\dfrac{1}{2}\right)+3=-1+3=2\)