Question

Write the following in expanded form A)(X-2y-3z)^2 B) (-x+2y+z)^2

Answer 1

Answer:

(x-2y-3z)^2

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

x^2+4y^2+9z^2-4xy+6yz-3zx

this sum is done according to (a+b+c)^2