Let alpha~beta be the roots of x^2-ax +b...

Let `alpha~beta` be the roots of `x^2-ax +b =0` and `A_n = alpha^n + beta^n`~ then `A_(n+1) - a A_n +b A_(n-1)` is equal to (A) `-a` (B) `b` (C) `0` (D) `a-b`

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