Write the rational expression in lowest terms s2 n2n s Sel

Write the rational expression in lowest terms. s^2 - n^2/n - s Select the correct choice below and, if necessary, fill in the answer A. s^2 - n^2/n - s = B. The expression is already in lowest terms.

Solution

(s^2-n^2)/(n-s)   = ((s+n)(s-n))/(n-s)

                         = - ((s+n)(n-s))/(n-s)

cancelling common factor (n-s)

                       =   - (s+n)