If a - b = 5 and a2 + b2 = 29, find the value of ab.	Options.
A) 6  B) 8  C) 10  D) 11  E) 2

Rationale: 2 ab = ( a 2 + b 2 ) - ( a - b ) 2 = 29 - 25 = 4 ab = 2 . answer : e
Answer: E