What are all the rational roots of the polynomial fx=20x4+x3+8x2+x-12 ？ - 4/5 and 3/4 - 4/5 and - 3/4 -1,- 4/5 , 3/4 , and 1 -1,- 4/5 ,- 3/4 , and 1

Write properties of function: x intercept/zero: x_{1} = - \dfrac{4}{5}; x_{2} = \dfrac{3}{4}