If A^2 + B^2 = 15 and AB = 25, what is the value of the expression (A - B)^2 + (A + B)^2?
Choose the correct answer
A) 10  B) 20  C) 30  D) 60  E) 50
(a-b)^2 = a^2 + b^2 - 2ab = 15-25= -10   (a+b)^2 = a^2 + b^2 + 2ab = 15+25= 
<gadget id="calculator">15+25</gadget>
<output>40</output>
40   so (a+b)^2 + (a-b)^2= 40 - 10 = 50   50
<result>E</result>
If A^2 + B^2 = 15 and AB = 25, what is the value of the expression (A - B)^2 + (A + B)^2?