Question

(-5x + 2y + z)^2 please tell me it's answer​

Answer 1

Step-by-step explanation:

${(-5x+2y+z)}^{2} \\ = {(-5x)}^{2} + {(2y)}^{2} + {(z)}^{2} +2((-5x \times 2y) + 2y \times z + z \times ( - 5y)) \\ = 25 {x}^{2} + 4 {y}^{2} + {z}^{2} + 2(( - 10xy) + 2yz + ( - 5xz)) \\ = 25 {x}^{2} + 4 {y}^{2} + {z}^{2} + 2(2yz - 10xy - 5xz) \\ = 25 {x}^{2} +4 {y}^{2} + {z}^{2} + 4yz - 20xy - 10xz$