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a2-15a+48=0 হলে, a এর মান
= [-(-15)+√{(-15)2-4×1×48}]÷(2×1)
= {15+√(225-192)}÷2
= (15+√33)÷2
= [-(-15)+√{(-15)2-4×1×48}]÷(2×1)
= {15+√(225-192)}÷2
= (15+√33)÷2
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