If a - b = 5 and a2 + b2 = 29, find the value of ab.	Choose the correct choice.
A) A)2  B) B)12  C) C)15  D) D)18  E) E)20
Explanation:   2ab = (a2 + b2) - (a - b)2   = 29 - 25= 
<gadget id="calculator">29 - 25</gadget>
<output>4</output>
4   ab= 2.   2nswer: 2
<result>A</result>
If a - b = 5 and a2 + b2 = 29, find the value of ab.