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निम्न व्यंजकों के गुणनखण्ड ज्ञात कीजिए(i) 9x2 – 25y2(ii) 16 – 81x2(iii) 100x2 – 81y2(iv) (a + b)2 – 9c2 |
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Answer» (i) 9x2 – 25y2 = (3x)2 – (5y)2 = (3x + 5y)(3x – 5y) (ii) 16 – 81x2 = (4)2 – (9x)2 = (4 + 9x)(4 – 9x) (iii) 100x2 – 81y2 = (10x)2 – (9y)2 = (10x + 9y) (10x – 9y) (iv) (a + b)2 – 9c2 = (a + b)2 – (3c)2 = (a + b + 3c)(a + b – 3c) |
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