8. 4x2 - 7 xy + 4y2-3,5 +6y2 - 8xy + x² +6 - 2xy + 2x² - 5y?
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+ 17q
(8) 4x2 – 7xy + 4y2 – 3, 5 + 6y2 – 8xy + x2 and 6 – 2xy + 2x2 – 5y2.
= 4x2 – 7xy + 4y2 – 3 + 5 + 6y2 – 8xy + x2 + 6 – 2xy + 2x2 – 5y2
= 7x2 – 17xy + 5y2 + 8
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