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if f'(x)=(x -4) (x-5) (x-6) (x-7) then....

if f'(x)=(x -4) (x-5) (x-6) (x-7) then.

A

f(x) =0 has four roots

B

three roots f(x) =0 lie in (4,5) `uu(5,6) uu(6,7)`

C

the equation `f(x) =0` has only one real root.

D

three roots of f(x) =0 lie in (3,4) `uu (4,5) uu (5,6)`

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