1- According to the national root theorem, which of the following are possible rational roots of 5x^3+2x^2+6x-4=0?. Select all that apply
a) -2/5
b) -1/3
c) 1/2
d) -4
2- According to the national root theorem, which of the following are possible rational roots of x^4+3x^3+2x^2-8x-9=0? Select all that apply.
a) -3
b) -1
c) 1/9
d) 3