Find the square root of x^2 + 4y^2 + 9z^2 - 4xy + 6xz - 12yz.

D) pm(x - 2y + 3z)

Expanding (x - 2y + 3z)^2 gives x^2 + 4y^2 + 9z^2 - 4xy + 6xz - 12yz, so its square root is pm(x - 2y + 3z). SLO M-09-A-20 · Understanding