Question

Find the least common denominator of the two rational expressions:

Answer 1

\[k^2-9=\left( k+3 \right)\left( k-3 \right)\]
L.C.D. of (k+3)(k-3) and k+3 is=?

Answer 2

l.c.m of (k+3)(k-3) and 3+k is (k+3(k-3)=k^2-9