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6. Use Descartes's Rule of Signs to (i) determine the possible numbers of positive and negative real zeros of the function (x)--2x+13x-21x2 +2x+8 (ii)

6. Use Descartes's Rule of Signs to (i) determine the possible numbers of positive and negative real zeros of the function (x)--2x+13x-21x2 +2x+8 (ii) list the possible rational zeros of the function and (iii) determine the zeros of the function.

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