x2 + y2 =34 এবং xy = 15 হলে (x-y)2 =?

x² + y² =34 এবং xy = 15 হলে (x-y)² =?

A ৬

B ৫

C 8

D ৭

Solution

Correct Answer: Option C

(x–y)² = x² + y² –2xy

= 34–2.15

= 34–30 = 4