Easy
1 point
ID: #28160
Question
a+b = √7 এবং a-b= √5 হলে, 8ab(a² + b²) = কত?
Options
1
12
Correct Answer
2
24
Correct Answer
3
36
Correct Answer
4
40
Correct Answer
Explanation
8ab(a² + b²) = 4ab × 2(a² + b²)
= {(a+b)² - (a-b)²} × {(a+b)² + (a-b)²}
= {(√7)² - (√5)²} × {(√7)² + (√5)²}
= (7 - 5) × (7 + 5) = 2 × 12 = 24।
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Type
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