If a and b are the roots of the equation x2 - 6x + 6 = 0, then the value of a2 + b2 is:	Choose the correct choice from the following answers:
A) 36  B) 24  C) 17  D) 6  E) 5

Rationale: "sol . ( b ) the sum of roots = a + b = 6 product of roots = ab = 6 now , a 2 + b 2 = ( a + b ) 2 - 2 ab = 36 - 12 = 24 answer b"
Answer: B