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Question

If p(x)=a0+a1x+...+anxn and |p(x)|ex11 for all x0, then |a1+2a2+3a3+...+nan|

A
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Solution

The correct option is B 1
We have, p(1)=limh0p(1+h)p(1)hp(1)=limh0p(1+h)p(1)h

=limh0|p(1+h)p(1)||h|limh0|p(1+h)+p(1)||h| ........(1)

Now, |p(x)|ex11|p(1h)|eh1 and |p(1)|0p(1)=0

Hence, p(1)limh0eh1|h|=1

p(1)1|a1+2a2+3a3+...+nan|1

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