Question

What is the difference?

Answer 1

4th option

Explanation:

Given

`(x)/(x^2+3x+2)` -
`(1)/((x+2)(x+1))` ← expand denominator using FOIL

=
`(x)/(x^2+3x+2)` -
`(1)/(x^2+3x+2)`

Since the denominators are common, then subtract the numerators

=
`(x-1)/(x^2+3x+2)`