Question

Which of the following represents the set of possible rational roots for the polynomial shown below?

2x³+5x²-8x-20=0

a. {±1, ±2, ±4, ±5, ±10, ±20}
b. {±2/5, ±1/2, ±1, ±2/5, ±1/5, ±1/10}
c. {±1/2, ±1, ±2, ±5/2, ±4, ±5, ±10, ±20}
d. {1/2, 1, 2, 5/2, 4, 5, 10, 20}

Answer 1

you should consider factor of 20 which is +- 1,2,4,5,10,20
then do the same for 2 which is +- 1,2
then 1/1,1/2,-1/1,-1/2
2/1,2/2,-2/1,-2/2
4/1,4/2,-4/1,-4/2
so on

Answer 2

sory it should be c,

I didnt see it