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प्रश्न
Simplify: 5 x (2x + 3y) – 2x (x – 9y)
बेरीज
उत्तर
5 x (2x + 3y) – 2x (x – 9y)
= 10x2 + 15xy – 2x2 + 18xy
= 10x2 – 2x2 + 15xy+ 18xy
= 8x2 + 33xy
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