Let α and β be the roots of equation x2−6x−2=0. if an=αn−βn for n≥1,then the value a10−2a82a9 is equal to
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a
3
b
-3
c
6
d
-6
answer is A.
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Detailed Solution
lt is given that α and β are roots of the equationx2−6x−2=0 ∴ α+β=6 and αβ=−2 we have an=αn−βn∴ a10−2a82a9=α10−β10−2α8−β82α9−β9=α10−β10+αβα8−β82α4−β9=α9(α+β)−β9(α+β)2α9−β9=(α+β)α9−β92α9−β9=α+β2=62=3