Problem: The fraction a2+x2a2+x2​−a2+x2​x2−a2​​ reduces to
Answer Choices:
A. 0
B. a2+x22a2​
C. (a2+x2)3/22x2​
D. (a2+x2)3/22a2​
E. a2+x22x2​
Solution:
Multiply numerator and denominator by a2+x2​ and simplify. (D) is the correct choice.