Question

express it please in full process​

Answer 1

Step-by-step explanation:

${(a + b - c)}^{2} \\ \\ = {a}^{2} + {b}^{2} - {c}^{2} + 2ab - 2bc - 2ac \\ \\ given \: equation \: = \: { \: \:(2x + y - 3 {z}^{2} })^{2} \\ \\ 2 {x}^{2} + {y}^{2} - 9 {z}^{4} + 2 \times 2x \times y - 2 \times y \times 3 {z}^{2} - 2 \times 2x \times 3 {z}^{2} \\ \\ 2 {x}^{2} + {y}^{2} - {9}^{4} + 4xy - 6y {z}^{2} - 12x {z}^{2}$

Answer 2

Step-by-step explanation:

(a+b-c)²=a²+b²+c²+2ab-2bc-2ca

(2x+y-3z)²=4x²+y²+9z²+4xy-6yz-12xz