If a - b = 3 and a2 + b2 = 29, find the value of ab.
Pick one
A) 10
B) 12
C) 13
D) 15
E) 18
2ab = (a2 + b2) - (a - b)2   = 29 - 9= 
<gadget id="calculator">29 - 9</gadget>
<output>20</output>
20   ab= 10.   answer :10
<result>A</result>
If a - b = 3 and a2 + b2 = 29, find the value of ab.