a-b = 2 এবং ab = 24 হলে a2-b2=?
A
16
B
20
C
26
D
30
Correct Answer: 20
এখানে, a- b =2, ab = 24 (a+b)^2 = (a-b)^2 +4ab = 4+96 (a+b) = 10 a^2-b^2 =(a+b) (a-b) =10.2 =20