If alpha and beta are zeros of polynomial 2x2-5x+7,then find the value of alpha^-1+beta^-1.
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alpha^-1 +beta^-1can be written as 1/alpha +1/beta .by solving it we get alpha+beta/alpha×beta now getting the values of zeroes that is alpha+beta=5/2
alpha×beta =7/2 we get answer 5/7
alpha×beta =7/2 we get answer 5/7
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