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Q.

The values of 'a' for which all the roots of the equation x4 – 4x3 – 8x2 + a = 0 are real and distinct, then

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a

0 < a < 3

b

2≤a≤3

c

2≤a≤4

d

0<a≤2

answer is A, B.

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Detailed Solution

x4−4x3−8x2=−af(x)=x2x2−4x−8=0,f(x)=−a−3<−a<00<a<3
 

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