Discuss Forum

1. a2-b2=15

  • A. 4
  • B. 4
  • C. 4
  • D. 4

Answer: Option A

Explanation:

a2-b2= 15

=> (a+b)(a-b) = 15/5 [∵a+b = 5]

=> (a-b) = 3

 

now, a+b+a-b = 5+3

=> a = 4

and, a+b = 5

=> b = 1

 

∴ ab = 4

Post your comments here:

Name:
Mobile:
Email:(Optional)

» Your comments will be displayed only after manual approval.