If a and b are the roots of the equation x2 - 9x + 9 = 0, then the value of a2 + b2 is:
Choose the correct choice from the following answers.
A) 63 B) 24 C) 17 D) 6 E) 5
Sol.(b) The sum of roots = a+ b = 9   Product of roots = ab = 9   Now, a2 + b2 = (a + b)2 - 2ab = 81 - 18= 
<gadget id="calculator">81 - 18</gadget>
<output>63</output>
63   63nswer 63
<result>A</result>
If a and b are the roots of the equation x2 - 9x + 9 = 0, then the value of a2 + b2 is: