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find all real zeros if the function P(x)=2x^4-x^3-4x^2+10x-4 i know all possible zeros are + or...

find all real zeros if the function P(x)=2x^4-x^3-4x^2+10x-4
i know all possible zeros are + or - 1, +- 1/2, +-2, +-4
im not sure how to do this and show the work
Math   Precalculus   
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