(-2x+5y-3z) to the power 2 is
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(-2x+5y-3z)² =[5y-(2x+3z)]² = 25y²-2.5y.(2x+3z)+(2x+3z)² =25y²-20xy-30yz+ 4x²+2.2x.3z+9z² =4x²+25y²+9z²-20xy+12xz-
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