Question

please solve fast
don't answer if u don't know​

Answer 1

Step-by-step explanation:

$according \: the \: question \\ let \: that \: number \: is \: \alpha \\ 2 {y}^{2} - 4yz - 2 {z}^{2} + \alpha = {y}^{2} - 2z - {z}^{2} \\ \alpha = {y }^{2} - 2z - {z}^{2} - (2 {y}^{2} - 4yz - 2 {z}^{2} ) \\ \alpha = {y}^{2} - 2z - {z}^{2} - 2 {y}^{2} + 4yz + 2 {z}^{2} \\ \alpha = - {y}^{2} + {z}^{2} - 2z + 4yz \\ yahi \: shoul \: h \: to \: be \: added$