Taylor Series - Range of values

In summary, the conversation is about finding the first four non-zero values for the Taylor expansion of exp(x) and determining the range of x values for which the expansion is valid. The suggestion is to use the ratio test to determine when the Taylor series converges, which will also indicate the valid x values for the expansion.
  • #1
wombat4000
36
0

Homework Statement



im being asked for the first 4 non zero values for the taylor expansion of exp(x) which is simple, but then it asks for the range of x values that are valid for the expansion.

i have never come across ths before - any idea?
 
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  • #2
From the first four coefficients of the taylor expansion you can guess what the nth coefficient is going to be. Is there then some test you can use to find out when a sum (don't worry about it being a taylor series!) converges?
 
  • #3
ratio test? integral test?

but how will working out if the sum convereges help with obtaining the valid x values?
 
  • #4
The ratio test is useful for calculating when taylor series converge. Each of the terms of your sum is in terms of 'x' so the ratio test tells you when the sum converges in terms of x.
 
  • #5
the question doesn't mention sum or convergence?
 
  • #6
The taylor series expansion is going to be valid where the sum converges, or alternatively you can just write that the taylor series expansion for exp is valid everywhere if you've been told this fact.
 

1. What is the purpose of a Taylor Series?

A Taylor Series is a mathematical tool used to approximate a non-polynomial function with a polynomial function. It allows for the calculation of complex functions by breaking them down into simpler terms.

2. How is the range of values determined in a Taylor Series?

The range of values in a Taylor Series is determined by the interval of convergence, which is the range of input values where the series will converge to the actual value of the function. This is typically determined using the ratio or root test.

3. Can a Taylor Series accurately represent any function?

No, a Taylor Series can only accurately represent a function within its interval of convergence. Outside of this range, the series may not converge to the actual value of the function and may provide inaccurate results.

4. How many terms should be included in a Taylor Series for accurate representation?

The number of terms required for accurate representation varies for each function and depends on the desired level of precision. Generally, the more terms included, the more accurate the representation will be.

5. Can a Taylor Series be used to find the exact value of a function?

No, a Taylor Series can only approximate the value of a function. It becomes more accurate as more terms are included, but it will never give the exact value of the function.

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