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Expand (2x-y-3z)²

{(2 x - y - 3 z)}^{2} = {[2 x + (- y) + (- 3 z)]}^{2} = {(2 x)}^{2} + {(- y)}^{2} + {(- 3 z)}^{2} + 2 (2 x) (- y) + 2 (- y) (- 3 z) + 2 (- 3 z) (2 x) = 4 x^{2} + y^{2} + 9 z^{2} - 4 xy - 6 yz - 12 zx Using identity : {(a + b + c)}^{2} = a^{2} + b^{2} + c^{2} + 2 ab + 2 bc + 2 ca

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