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Identify the root of a polynomial functions

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


 How many roots does P(x)=x3x2x2P(x)=x^3-x^2-x-2  has?


How many roots doesP(x)=2x2+8x42P(x)=2x^2+8x-42 have?


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


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


How many roots does p(x)= 4x2-17x+15


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)=2x46x34x+12P(x)=2x^4-6x^3-4x+12  has?


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