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If alpha, beta arethe roots of the equat...

If `alpha, beta` arethe roots of the equation `x^2-ax+b=0 and A_n=alpha^n+beta^n` then which of the following is true? (A) `A_(n+1)=aA_n+bA_(n-1)` (B) `A_(n+1)=bA_n+aA_(n-1)` (C) `A_(n+1)=aA_n-bA_(n-1)` (D) `A_(n+1)=bA_n+-aA_(n-1)`

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