Question

x²+4y²+z²+4xy-2xz-4yz​

Answer 1

Answer:

${(x + 2y - z)}^{2}$

Step-by-step explanation:

${x }^{2} + 4 {y}^{2} + {z}^{2} + 4xy - 2xz - 4yz \\ {x}^{2} + {(2y)}^{2} + {( - z)}^{2} + 2 \times x \times2 y +2 \times x \times ( - z) + 2 \times 2y \times ( - z) \\ {(x + 2y - z)}^{2} \\ = = = = = = = =$