Author: Yousef Aloufi (CHEME 6800 Fall 2021)
f ( x ) = y 1 + y 2 + ( x 1 ) 2 + ( x 2 ) 2 {\displaystyle f(x)=y_{1}+y_{2}+{\big (}x_{1}{\big )}^{2}+{\big (}x_{2}{\big )}^{2}}