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If a lt b lt c lt d then f(x) = (x -a) (...

If `a lt b lt c lt d` then `f(x) = (x -a) (x-c)+ lambda(x-b) (x-d)` has real roots

A

For all `lambda`

B

Ony when `lambda gt 0`

C

Only when `lambda lt 0`

D

For no `lambda`

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