find the zeroes of the polynomial p(x)=x2+x-20
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-1+ or - root of 1^2+80/2
-1 + or - root of 81/2
-1 (+ or -)9/2
-1+9/2 (or) -1-9/2
8/2 (or) -10/2
4 (or) -5
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