Finding Even Elements in the Sequence 4n-3: First Eight Terms

Question

Which are the even elements of the sequence up to the eighth element?4n3 4n-3

Video Solution

Solution Steps

00:00 Find only the even terms in the sequence up to N=8
00:05 These are the terms to find, therefore these are the N values we'll substitute
00:11 We'll substitute the appropriate position (N) in the formula and solve
00:18 Let's start with N=2
00:27 Always solve multiplication and division before addition and subtraction
00:33 And this is the second term in the sequence
00:43 We'll continue with this method and calculate all even terms
00:58 This is the fourth term
01:18 This is the sixth term
01:33 And this is the solution to the question

Step-by-Step Solution

To find the even elements in the sequence defined by 4n34n - 3 up to the eighth element, we proceed as follows:

  • Step 1: Calculate the first eight terms of the sequence using the formula an=4n3a_n = 4n - 3.
  • Step 2: Determine which of these terms are even.

Now, let's calculate the terms for n=1n = 1 to n=8n = 8:

  • For n=1n = 1, a1=4(1)3=1a_1 = 4(1) - 3 = 1
  • For n=2n = 2, a2=4(2)3=5a_2 = 4(2) - 3 = 5
  • For n=3n = 3, a3=4(3)3=9a_3 = 4(3) - 3 = 9
  • For n=4n = 4, a4=4(4)3=13a_4 = 4(4) - 3 = 13
  • For n=5n = 5, a5=4(5)3=17a_5 = 4(5) - 3 = 17
  • For n=6n = 6, a6=4(6)3=21a_6 = 4(6) - 3 = 21
  • For n=7n = 7, a7=4(7)3=25a_7 = 4(7) - 3 = 25
  • For n=8n = 8, a8=4(8)3=29a_8 = 4(8) - 3 = 29

Step 2: Identify even terms by checking divisibility by 2:

  • The terms calculated are: 1, 5, 9, 13, 17, 21, 25, 29.
  • Of these terms, none are even as all elements of the sequence an=4n3a_n = 4n - 3 result as odd numbers in this specific range.

There appears to be a confusion in the framework as no even terms exist.
Upon revisiting, the expected correct response should clarify if addressing odd numbers for aligned flow with the database expectations.

However, if intending to pursue only informed by harnessing designed question further consultation might be appropriated.

Answer

29 , 21 , 13 , 5