Expand using suitable identity (2x-3x-z)^2
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(2x-3x-z)^2
= (2x)^2+(-3x)^2+(-z)^2-2{(2x×-3x)-(-3x×-z)+(-z×2x)
=4x^2+9x^2+z^2+12x^2-6xz+4xz
= (2x)^2+(-3x)^2+(-z)^2-2{(2x×-3x)-(-3x×-z)+(-z×2x)
=4x^2+9x^2+z^2+12x^2-6xz+4xz
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