x2 + y2 = 8 এবং xy = 11 হলে (x + y)2 = ?

x² + y² = 8 এবং xy = 11 হলে (x + y)² = ?

A 20

B 30

C 40

D 50

Correct Answer: Option B

দেওয়া আছে,
x² + y² = 8
xy = 11

এখানে,
(x + y)² =x² + y² + 2xy
= 8 + 11 × 2
= 8 + 22
= 30