If a - b = 3, a^2 + b^2 = 29 ,find the value of ab.	Choose the correct answer: A) 10 B) 12 C) 15 D) 18 E) 19
Explanation:   2ab = (a^2 + b^2) - (a - b)^2 = 29 - 9= 
<gadget id="calculator">29 - 9</gadget>
<output>20</output>
20=&gt; ab = 10..   10nswer: 10
<result>A</result>
If a - b = 3, a^2 + b^2 = 29 ,find the value of ab.