Question

What is the sum

Answer 1

4th

Answer 2

(1/(2b)) + (b/2)
These need to have a least common denominator, in other words the denominators have to be made equal. Note in the (b/2) part that if you multiply the 2 by b, then the denominators will be equal. But you have to also multiply the numerator of (b/2) by b so that the change in the numerator reflects that change in the denominator:
= (1/(2b)) + (b*b/(2b))
= (1 + b^2) / (2b)
= (b^2 + 1) / (2b)

FINAL ANSWER b^2+1/2b