a² - b² = 8 এবং ab = 3 হলে a² + b² = কত?
Solution
Correct Answer: Option A
দেওয়া আছে, a² + b² = 8
এবং ab = 3
.: (a² + b²)² = (a² - b²)² + 4a².b²
= (8)²+4(ab)²
= 64+ 4.3²
= 64 + 36
বা,(a²+b²)² = 100
বা, a² + b² = ±10
এবং ab = 3
.: (a² + b²)² = (a² - b²)² + 4a².b²
= (8)²+4(ab)²
= 64+ 4.3²
= 64 + 36
বা,(a²+b²)² = 100
বা, a² + b² = ±10
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