Question

pls solve fastly pls​

Answer 1

Answer:

${4 + 2y - 3z}^{2}$

Answer 2

Step-by-step explanation:

(x+y+x)² = x² + y² + z² + 2(xy + yz + zx)

(-x+2y-3z)² = (-x)² + (2y)² + (-3z)² + 2[(-x)(2y) + 2y(-3z) + (-3z)(-x)]

= x² + 4y² + 9z² + 2[-2xy - 6yz + 3xz]

= x² + 4y² + 9z² - 4xy - 12yz + 6xz