Question

X - 1/X = 7 ആയാൽ X² + 1/X² എത്ര?

• A. 51
• B. 47
• C. 49
• D. 15

Answer 1

Answer:

A. 51

X - 1/X = 7 ( X - 1/X)² = X² - 2 × X × 1/X + 1/X² X² + 1/X² = ( X - 1/X)² + 2 = 7² + 2 = 49 + 2 = 51