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

Look at the following set of numbers and determine if there is any property, if so, what is it?

\( 94,96,98,100,102,104 \)

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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