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1 April, 09:27

5. From 6x^2-7xy+8y^2 subtract the sum of x^2-3xy-y^2and 2x^2+5xy-4y^2

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  1. 1 April, 09:40
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    6x^2 - 7xy + 8y^2 - (x^2 - 3xy - y^2 + 2x^2 + 5xy - 4y^2)

    6x^2 - 7xy + 8y^2 - (3x^2 + 2xy - 5y^2)

    6x^2 - 7xy + 8y^2 - 3x^2 - 2xy + 5y^2

    3x^2 - 9xy + 13y^2
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