If a - b = 3 and a(power 2) + b(power 2) = 27, find the value of ab.	Select:  A) 5  B) 9  C) 4  D) 10  E) 3
2ab = (a(power 2) + b(power 2) - (a - b)(power 2)   = 27 - 9= 
<gadget id="calculator">27 - 9</gadget>
<output>18</output>
18   ab= 9.   Answer is 9.
<result>B</result>
If a - b = 3 and a(power 2) + b(power 2) = 27, find the value of ab.