If a - b = 3 and a(power 2) + b(power 2) = 39, find the value of ab.  Choose one.
A) 15	B) 8	C) 4	D) 10	E) 3
2ab = (a(power 2) + b(power 2) - (a - b)(power 2)   = 39 - 9= 
<gadget id="calculator">39 - 9</gadget>
<output>30</output>
30   ab= 15.   15nswer is 15.
<result>A</result>
If a - b = 3 and a(power 2) + b(power 2) = 39, find the value of ab.