Question: im having trouble solving this problem... i get stuck after i plug in the values but i dont think im doing it right. can anyone

im having trouble solving this problem... i get stuck after i plug in the values but i dont think im doing it right. can anyone help me?

h(x)= 3x^3 + x^2 -12x -4; x-intercepts are: x= -2, x=-1/3, x=2

a. How many roots will the polynomial have?

b. If all the roots are real, factor this polynomial

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