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Q.

Let all the 2022 zeroes of the polynomial P(x)=a2022x2022+a2021x2021+...+a1x+a0, where a2022,a2021,...,a0R  and  a20220, be real, distinct and less than 1. For any such polynomial, consider the function f(x)=a2022e2022x2022+a2021e2021x2021+...+a1ex+a0x, then 

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a

f is increasing in (0,)

b

f'(x) has 2022 real zeroes in (,0)

c

f"(x) has no real zero in (0,)

d

f is decreasing in (0,)

answer is B.

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Detailed Solution

P(x) has 2022 zeros in (,1)

 using Rolle’s theorem   also has all zeros in (,1).

Now f'(x)=P(ex) and f"(x)=P'(ex)ex but ex>1x(0,)

  f'(x) and f"(x) have no zero in (0,)

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Let all the 2022 zeroes of the polynomial P(x)=a2022x2022+a2021x2021+...+a1x+a0, where a2022 ,a2021, ... ,a0 ∈ R  and  a2022≠0, be real, distinct and less than 1. For any such polynomial, consider the function f(x)=a2022e2022x2022+a2021e2021x2021+...+a1ex+a0x, then