If a - b = 3 and a(power 2) + b(power 2) = 39, find the value of ab.	Select the correct option:
A) 15  B) 8  C) 4  D) 10  E) 3

Rationale: "2 ab = ( a ( power 2 ) + b ( power 2 ) - ( a - b ) ( power 2 ) = 39 - 9 = 30 ab = 15 . answer is a ."
Answer: A