Q1. Add: (3x2y - 5xy + 7) and (- 9x2y – 5xy - 3)
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Answer:
3×2y-5xy+7+(-9x2y-5xy-3)
=3×2y-5xy+7-9×2y-5xy-3
=6y-5xy+7-18y-5xy-3
=6y-12xy-18y-5xy-3
=6y-18y-12xy-5xy-3
=12y-7xy-3(ans)
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