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