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Engineering Mathematics Miscellaneous

Engineering Mathematics

  1. In the Taylor series expansion of ex about x = 2 the coefficient of (x – 2)4 is
    1. 1 / 4!
    2. 24 / 4!
    3. e2 / 4!
    4. e4 / 4!
Correct Option: C

Taylor series expansion of f(x) about a is given by

f(x) = f(a) +
(x - a)
f '(a) +
(x - a)2
f ''(a) + .......
1!2!

coefficient of (x - a)4 is
f ''''(a)
4!

Now f(x) = ex
⇒ f ''''(x) = ex
⇒ f ''''(a) = ea
Hence for a = 2,
f ''''(a)
=
e2
4!4!



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