If a and b are the roots of the equation x2 - 5x + 5 = 0, then the value of a2 + b2 is: Pick:
A) 36 B) 24 C) 15 D) 6 E) 5
Sol.(b) The sum of roots = a+ b = 5   Product of roots = ab = 5   Now, a2 + b2 = (a + b)2 - 2ab = 25 - 10= 
<gadget id="calculator">25 - 10</gadget>
<output>15</output>
15   Answer 15
<result>C</result>
If a and b are the roots of the equation x2 - 5x + 5 = 0, then the value of a2 + b2 is: