Question

What is the gcf of the numerator and denominator of the rational expression

3x-15/x^2-x-20


A: x-5
B: x+4
C: 4
D: 5

Answer 1

`(3x-15)/(x^2-x-20) = (3(x-5))/((x+4)(x-5))`

The only common factor is (x -5).

Selection A is appropriate.