If A^2 + B^2 = 30 and AB = 10, what is the value of the expression (A - B)^2 + (A + B)^2?
Choose the correct choice from the following:
A) 10  B) 20  C) 30  D) 60  E) 70
(a-b)^2 = a^2 + b^2 - 2ab = 30-20= 
<gadget id="calculator">30-20</gadget>
<output>10</output>
10   (a+b)^2= a^2 + b^2 + 2ab = 30+20= 
<gadget id="calculator">30+20</gadget>
<output>50</output>
50   so (a+b)^2 + (a-b)^2= 50 +10= 
<gadget id="calculator">50 +10</gadget>
<output>60</output>
60   60
<result>D</result>
If A^2 + B^2 = 30 and AB = 10, what is the value of the expression (A - B)^2 + (A + B)^2?