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Identify the root of a polynomial functions

How many roots does p(x)=2x4-6x3-4x+12


How many roots does p(x) = 6x2-x-2 has?


How many root does p(x)=x2+2x+1 has?


How many roots does p(x)= x3+2x2-4x-8


How many roots does p(x)= x3-x2+4x-4 has?


How many roots does P(x)=x3+2x24x8P(x)=x^3+2x^2-4x-8  has?


How many roots does p(x)=2x2+8x-42 has?


 How many roots does P(x)=4x217x+15P(x)=4x^2-17x+15  has?


How many roots does P(x)=x3x2+4x4P(x)=x^3-x^2+4x-4  has?


How many roots does P(x)=4x217x+15P(x)=4x^2-17x+15 has?