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
Sol.(b) The sum of roots = a+ b = 4   Product of roots = ab = 4   Now, a2 + b2 = (a + b)2 - 2ab = 16 - 8= 
<gadget id="calculator">16 - 8</gadget>
<output>8</output>
8   Answer 8
<result>D</result>
If a and b are the roots of the equation x2 - 4x + 4 = 0, then the value of a2 + b2 is: