Question

Expand (2x-y/3+4z)^2​

Answer 1

Answer:

(x+y+z)^2=x^2 + y^2 + z^2 + 2xy + 2yz + 2zx

(2x-y/3+4z)^2= (2x)^2 + (-y/3)^2 + (4z)^2 + 2×2x× -y/3 + 2×-y/3×4z + 2×4z×2x

=) 4x^2 + y/9^2 + 16z^2 + -4/3xy +

-8/3yz + 16zx

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