System of equations

Posts: 1100
Joined: Apr 11, 2005

by luimichael, Apr 4, 2017, 2:54 AM

Compute $z$ in the system: $\left\{\begin{matrix} x(x+2y)=21\\ y(y+2z)=-16\\ z(z+2x)=-5 \end{matrix}\right.$
solution