For x≥23x2+2x−3−4=0x2+2x−7=0x=2−2±4+28=−1±22 Only 22−1 is acceptable root For x<23 x2−2x+3−4=0 $\begin{aligned}
& x^2-2 x-1=0 \
& x=\frac{2 \pm \sqrt{4+4}}{2}=1 \pm \sqrt{2}
\end{aligned}Only1-\sqrt{2}isacceptableSumofthesquare=(1-\sqrt{2})^2+(2 \sqrt{2}-1)^2=6(2-\sqrt{2})$