CBSE Class 10 Answered
if alpha and beta are zeroes of the perpendicular f(x) =xsquare-x -k such tha alpha - beta=9 find k
Asked by venugopal.a.madathil | 20 Feb, 2019, 14:02: PM
Expert Answer
f(x) = x2 -x -k
if α and β are the zeroes of f(x), then we have,
α+β = 1 ..................(1)
αβ = -k ......................(2)
Given : α - β = 9 ........................(3)
By solving eqn.(1) and eqn.(3), we have α = 5 and β = -4
Hence from (2), we get k = 20
Answered by Thiyagarajan K | 20 Feb, 2019, 15:52: PM
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