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If alphaa n dbeta are the rootsof he eq...

If `alphaa n dbeta` are the rootsof he equations `x^2-a x+b=0a n dA_n=alpha^n+beta^n` , then which of the following is true? a.`A_(n+1)=a A_n+b A_(n-1)` b. `A_(n+1)=b A_(n-1)+a A_n` c. `A_(n+1)=a A_n-b A_(n-1)` d. `A_(n+1)=b A_(n-1)-a A_n`

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