Expanded form of [-2x-3y+2z]^2
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∵(a+b+c)²=a²+b²+c²+2ab+2bc+2ca
∴[(-2x)+(-3y)+(2z)]=(-2x)²+(-3y)²+(2z)²+2(-2x)(-3y)+2(-3y)(2z)+2(2z)(-2x)
=4x²+9y²+4z²+12xy-12yz-8zx Ans
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Use identity no 5 and u can solve the answer do your self
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