Respuesta :

Answer:

(x+c)(x-d)

Step-by-step explanation:

if x²-ax-b=(x-c)(x+d)

from vieta theorem

c + d =  -(-a)=a

cd = b

if x²+ax-b

from vieta theorem

c + d =  -(a)=-a  

cd = b

so the same c d but in opposite  sign (x+c)(x-d)