(viii) 21x = 196 – x2
Sol. 21x = 196 – x2
∴ x2 + 21x – 196 = 0
∴ x2 – 28x – 7x – 196 = 0
∴ x (x + 28) – 7 (x + 28) = 0
∴ (x + 28) (x – 7) = 0
∴ x + 28 = 0 or x – 7 = 0
∴ x = –28 or x = 7
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Colours name in Hindi | रंगों के नाम
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AA (ा) – AA ki Matra | आ (ा) की मात्रा
i ( ि) - i ki Matra | इ ( ि) की मात्रा
EE ( ी) – EE ki Matra | ई ( ी) की मात्रा
U (ु) - U ki Matra | उ (ु) की मात्रा
O (ू ) – OO ki Matra | ऊ (ू) की मात्रा
E ( े) - E ki Matra | ए ( े ) की मात्रा
AI (ै) - AI ki Matra | ऐ (ै)की मात्रा
o ( ो) - o ki Matra | ओ (ो) की मात्रा
ou ( ौ) - ou ki Matra | औ ( ौ) की मात्रा
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