Which of the following is equal to the average (arithmetic mean) of (x+1)^2 and (x-1)^2?
Select the correct option:
A) x^2  B) x^2+1  C) x^2 +4  D) x^2+2x  E) x^2+4x
Avg = [(x+1)^2 + (x-1)^2] / 2   Expanding and simplifying, (x^2 + 2x + 1 + x^2 -2x + 1 ) / 2 = x^2 + 1   Answer x^2+1.
<result>B</result>
Which of the following is equal to the average (arithmetic mean) of (x+1)^2 and (x-1)^2?