If a - b = 5 and a2 + b2 = 34, find the value of ab.	Pick:
A) A)4.5
B) B)12
C) C)15
D) D)18
E) E)20
Explanation:   2ab = (a2 + b2) - (a - b)2   = 34 - 25= 
<gadget id="calculator">34 - 25</gadget>
<output>9</output>
9   ab= 4.5.   4.5nswer: 4.5
<result>A</result>
If a - b = 5 and a2 + b2 = 34, find the value of ab.