For the first one, use the the sum of roots and the product of roots formula (Vieta), then for part (b) expand the polynomial in terms of 1/alpha and 1/beta and use (a) to figure out the coefficients. For the second question, use sum of roots to figure out alpha+beta. Then solve for alpha and beta and conclude.

第一條將條式通分母 第二條式搵sum of root 解方程

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