factorise : 2x^2 + y^2+8z^2-2√2xy+4√2yz-8zx
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Use identity
(a+b+c)^2= a^2+b^2+c^2+2ab+2bc+2ca
(a+b+c)^2= a^2+b^2+c^2+2ab+2bc+2ca
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