Find the 10th Term in the Sequence 5n-3: Step-by-Step Solution

Arithmetic Sequences with Direct Term Calculation

5n3 5n-3

What is the value of the 10th element in the sequence above?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the 10th term in the sequence
00:04 Substitute the corresponding term position in the sequence formula and solve
00:08 Substitute N = 10 in the sequence formula
00:20 Always solve multiplication and division before addition and subtraction
00:29 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

5n3 5n-3

What is the value of the 10th element in the sequence above?

2

Step-by-step solution

To solve this problem, let's work through these steps:

  • Step 1: Identify the expression defining the sequence.
  • Step 2: Substitute n=10 n = 10 into the expression.
  • Step 3: Perform the arithmetic calculation.
  • Step 4: Verify if the resulting term corresponds to any given choices.

Now, let's proceed with each step:

Step 1: The sequence is defined by the expression an=5n3 a_n = 5n - 3 .

Step 2: To find the 10th element, substitute n=10 n = 10 into the expression:
a10=5(10)3 a_{10} = 5(10) - 3 .

Step 3: Carry out the calculation:
a10=503=47 a_{10} = 50 - 3 = 47 .

Step 4: Upon checking the possible answers, the calculated value a10=47 a_{10} = 47 matches option 47 47 .

Therefore, the value of the 10th element in the sequence is 47 47 .

3

Final Answer

47

Key Points to Remember

Essential concepts to master this topic
  • Formula: Use an=5n3 a_n = 5n - 3 where n is term position
  • Substitution: Replace n with 10: a10=5(10)3=47 a_{10} = 5(10) - 3 = 47
  • Verification: Check answer matches given choices and arithmetic is correct ✓

Common Mistakes

Avoid these frequent errors
  • Confusing term position with term value
    Don't use the term value (like 47) as n in the formula = wrong calculation! Students often mix up which number goes where. Always use the position number (10th term means n = 10) in the sequence formula.

Practice Quiz

Test your knowledge with interactive questions

Is there a term-to-term rule for the sequence below?

18 , 22 , 26 , 30

FAQ

Everything you need to know about this question

What does the 'n' represent in the formula 5n - 3?

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The n represents the position of the term in the sequence. For the 10th term, n = 10. For the 5th term, n = 5, and so on.

Why do we subtract 3 in this sequence?

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The -3 is a constant that shifts every term down by 3. Without it, the sequence would be 5, 10, 15, 20... but with -3, it becomes 2, 7, 12, 17...

Can I find any term in this sequence using the same method?

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Yes! Just substitute the term position for n. Want the 20th term? Calculate 5(20)3=97 5(20) - 3 = 97 . The formula works for any position.

How do I know if I did the arithmetic correctly?

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Double-check your calculation: 5×10=50 5 \times 10 = 50 , then 503=47 50 - 3 = 47 . Also verify your answer matches one of the given choices.

What if I get a negative number as an answer?

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That's possible! For early terms where n is small, 5n3 5n - 3 might give negative results. For example, when n = 0, we get 5(0)3=3 5(0) - 3 = -3 .

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