If a-b= 4 and a^2+b^2=80, find the value of ab Pick one
A) 10
B) 12
C) 15
D) 18
E) 32
2ab = (a^2 + b^2) - (a - b)^2   = 80 - 16= 
<gadget id="calculator">80 - 16</gadget>
<output>64</output>
64=&gt; ab = 32   ANSW32R:32
<result>E</result>
If a-b= 4 and a^2+b^2=80, find the value of ab