expand using algebraic identies (6x-6y+8z)^2
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Using Identity (a+b+c)^2 = a^2 +b^2 + c^2 + 2(ab + bc + ca)
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= 6x^2+6y^2+8z^2- 2×6x×6y- 2×6y×8z+ 2×6x×8z.
= 36x^2 + 36y^2 + 64z^2 - 72xy - 96yz + 108xz
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