Q.
If α,β are the roots of the equation x2+xα+β=0 , then the values of α and β are
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a
α=2 and β=−2
b
α=2 and β=1
c
α=1 and β=−2
d
α=1 and β=−1
answer is C.
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Detailed Solution
The given equation is x2+xα+β=0 ….. ( 1 ) α,β are the roots ( 1 ) ∴ sum of the roots : α+β=−α and Product of the roots : αβ=β ⇒α=1 [∵β=0 does not satisfy (1)] ∴ 1+β=−α ⇒ β=−1−α=−1−1=−2 .
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