Discussion Forum



1)

If a - b = 3 and a2 + b2 = 29, find the value of ab.


A) 10

B) 12

C) 15

D) 18

Answer:

Option A

Explanation:

$2ab = (a^{2}+b^{2})-(a-b)^{2}$

29 - 9 = 20

=> ab = 10