Question

1.) What is the least common denominator of the fractions? x-7/x+4 ÷ x/x+3

2.) what is the least common denominator of the fractions? 1/5nm3 3/10m4n

Answer 1

1) (x-7)(x+3)/x^2+4
= x^2-4x-21/(x^2+4)
and then use lond division method