Question:
If a² − b² = 40 and a − b = 4, find a + b.
यदि a² − b² = 40 और a − b = 4 है, तो a + b ज्ञात करें।
Options:
- a) 8
- b) 10
- c) 12
- d) 14
- a) 8
- b) 10
- c) 12
- d) 14
correct answer : b)
Explanation:
a²−b² = (a+b)(a−b). 40 = (a+b)×4 → a+b = 10.
a²−b² = (a+b)(a−b)। 40 = (a+b)×4 → a+b = 10।