Discuss Forum

1.

x-y=2 এবং xy=15 হলে, (x+y) এর মান কত?

  • A. 4
  • B. 4
  • C. 4
  • D. 4

Answer: Option B

Explanation:

দেওয়া আছে,
 X-Y=2
 XY=15
এখন, 
(X+Y)2 = (X-Y)2 +2XY

       = (2)2+2*2*15

       = 4+60

       = 64
X+Y =√64 
     =8


Post your comments here:

Name:
Mobile:
Email:(Optional)

» Your comments will be displayed only after manual approval.