If A^2 + B^2 = 15 and AB = 10, what is the value of the expression (A - B)^2 + (A + B)^2
Choose the correct answer:
A) 10 B) 20 C) 60 D) 30 E) 70
(a-b)^2 = a^2 + b^2 - 2ab = 15-20= -5   (a+b)^2 = a^2 + b^2 + 2ab = 15+20= 
<gadget id="calculator">15+20</gadget>
<output>35</output>
35   so (a+b)^2 + (a-b)^2= 35 - 5= 
<gadget id="calculator">35 - 5</gadget>
<output>30</output>
30   30
<result>D</result>
If A^2 + B^2 = 15 and AB = 10, what is the value of the expression (A - B)^2 + (A + B)^2