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Let alpha, beta be the roots of x^2 - ax...

Let `alpha, beta` be the roots of `x^2 - ax + b = 0,` where `alpha and beta in R.` If `alpha + 3beta = 0,` then
(A) `3 a^2 + 4b =0`
(B) `3 b^2 + 4a = 0`
(C) `b lt 0`
(D) `a lt 0`

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