Question:
What is the value of (√5 + √3)² + (√5 − √3)²?
(√5 + √3)² + (√5 − √3)² का मान क्या है?
Options:
- a) 12
- b) 16
- c) 20
- d) 24
- a) 12
- b) 16
- c) 20
- d) 24
correct answer : b)
Explanation:
(a+b)²+(a−b)²=2(a²+b²). So 2(5+3)=2×8=16.
(a+b)²+(a−b)²=2(a²+b²)। अतः 2(5+3)=2×8=16।