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

$\frac{3x-15}{x^2-x-20} = \frac{3(x-5)}{(x+4)(x-5)}$

The only common factor is (x -5).

Selection A is appropriate.