Question

z² + 8xyz + 16x²y2 - 9x4 - 12x2y² - 4y² =​

Answer 1

$z² + 8xyz + 16x²y ^{2} - 9x ^{4} - 12 {x}^{2} y² - 4y² = \\ {z}^{2} + 8xy + (16 {x}^{2} {y}^{2} - 12 {x}^{2} {y}^{2} ) +( - 9 {x}^{4} ) + ( - 4 {y}^{2} ) = \\ {z}^{2} + 8xyz + 4 {x}^{2} {y}^{2} - 9 {x}^{4} - 4 {y}^{2}$