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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