Discuss Forum

1. x+y= 7

  • A. 3
  • B. 3
  • C. 3
  • D. 3

Answer: Option C

Explanation:

Given, x + y = 7, xy = 10

Now, (x - y)^2 = (x + y)^2 - 4.xy

= 7^2 - 4.10

= 49 - 40

= 9

Post your comments here:

Name:
Mobile:
Email:(Optional)

» Your comments will be displayed only after manual approval.