If a - b = 6 and a2 + b2 = 48, find the value of ab.	Choose the correct choice:
A) 8
B) 10
C) 12
D) 6
E) 19

Rationale: "2 ab = ( a 2 + b 2 ) - ( a - b ) 2 = 48 - 36 = 12 ab = 6 . answer : d"
Answer: D