a - b = 7, ab = 60 হলে, a2 + b2 = কত?

a - b = 7, ab = 60 হলে, a² + b² = কত?

A 180

B 168

C 169

D 170

Solution

Correct Answer: Option C

দেওয়া আছে- a - b = 7, ab = 60

এখানে,
(a - b)² + 2ab =

= (7)² + 2.60

= 49 + 120

= 169