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Add: 4x^2-7xy+4y^2-3, 5+6y^2-8xy+x^2 and 6-2xy+2x^2-5y^2

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Add: 4x2-7xy+4y2-3, 5+6y2-8xy+x2 and 6-2xy+2x2-5y2

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Given 4x2-7xy+4y2-3, 5+6y2-8xy+x2 and 6-2xy+2x2-5y2

To add the given expression we have arrange them column wise is given below:

4x2-7xy+4y2-3

x2-8xy+6y2+5

2x2-2xy-5y2+6

7x2+5y2-17xy+8
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