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Identify the root of a polynomial functions

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


How many roots does P(x)=x2+2x+1P(x)=x^2+2x+1 have?


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


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


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


How many roots does P(x)=x29x10P(x)=x^2-9x-10  has?


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


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


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


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