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Evaluate the summation below.

5sum_(k=0)^(3)(1-3k^(2))
Answer:

Evaluate the summation below.\newline5k=03(13k2) 5 \sum_{k=0}^{3}\left(1-3 k^{2}\right) \newlineAnswer:

Full solution

Q. Evaluate the summation below.\newline5k=03(13k2) 5 \sum_{k=0}^{3}\left(1-3 k^{2}\right) \newlineAnswer:
  1. Write Terms Explicitly: Write out the terms of the series explicitly.\newlineThe series is 55 times the sum from k=0k=0 to 33 of (13k2)(1-3k^2). This means we need to calculate the value of (13k2)(1-3k^2) for each kk from 00 to 33 and then multiply the sum of these values by 55.
  2. Calculate Terms: Calculate the terms of the series.\newlineFor k=0k=0: (13(0)2)=1(1-3(0)^2) = 1\newlineFor k=1k=1: (13(1)2)=13(1)=13=2(1-3(1)^2) = 1-3(1) = 1-3 = -2\newlineFor k=2k=2: (13(2)2)=13(4)=112=11(1-3(2)^2) = 1-3(4) = 1-12 = -11\newlineFor k=3k=3: (13(3)2)=13(9)=127=26(1-3(3)^2) = 1-3(9) = 1-27 = -26
  3. Sum Terms: Sum the terms of the series.\newlineThe sum of the terms 13k21-3k^2 from k=0k=0 to 33 is 1+(2)+(11)+(26)1 + (-2) + (-11) + (-26).\newlineThis sum is 121126=381 - 2 - 11 - 26 = -38.
  4. Multiply by 55: Multiply the sum by 55. The final step is to multiply the sum of the series by 55. 5×(38)=1905 \times (-38) = -190.

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