Question

suitable identities (2x-y+z)^2​

Answer 1

Answer:

(2x-y+z)^2

= (2x)^2 + (-y)^2 + (z)^2 + 2×2x×-y + 2×-y×z + 2×z×2x

= 4x^2 + y^2 + z^2 - 4xy - 2yz + 4xz

By formula,

(a+b+c)^2

= a^2 + b^2 + c^2 + 2ab + 2bc + 2ca