If a and b are the roots of the equation x2 - 4x + 4 = 0, then the value of a2 + b2 is:  Choose the correct choice from the following answers.
A) 36  B) 24  C) 17  D) 8  E) 5

Rationale: "sol . ( b ) the sum of roots = a + b = 4 product of roots = ab = 4 now , a 2 + b 2 = ( a + b ) 2 - 2 ab = 16 - 8 = 8 answer d"
Answer: D