Is 10 a Term in the Sequence Defined by 4n+3?

Sequence Terms with Integer Verification

A sequence has the rule 4n+3 4n+3 .

Is the number 10 a term in the sequence?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Is the number 10 part of this sequence?
00:10 Let's plug it into the sequence formula and find N.
00:14 If we get a positive whole number for N, it's a match!
00:18 Okay, now let's carefully isolate N.
00:34 We found N is positive but not whole, so 10 isn't in the sequence.
00:40 And that's the answer to our question!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

A sequence has the rule 4n+3 4n+3 .

Is the number 10 a term in the sequence?

2

Step-by-step solution

To solve whether 10 is a term in the sequence defined by 4n+3 4n + 3 , follow these steps:

  • Step 1: Start with the equation for the sequence, 4n+3=10 4n + 3 = 10 .
  • Step 2: Subtract 3 from both sides to isolate the term with n n . This gives 4n=7 4n = 7 .
  • Step 3: Divide both sides by 4 to solve for n n . This results in n=74 n = \frac{7}{4} .

Since n=74 n = \frac{7}{4} , which is not an integer, it confirms that 10 is not a term in the sequence 4n+3 4n + 3 . For a number to be a term in this sequence, n n must be an integer. Thus, 10 is not part of the sequence because it does not satisfy this condition.

Therefore, the number 10 is not in the sequence.

The correct answer choice is:

  • Choice 4:

    No

3

Final Answer

No

Key Points to Remember

Essential concepts to master this topic
  • Rule: For sequence 4n+3, n must be a positive integer
  • Technique: Set 4n+3=10, solve: 4n=7, so n=7/4
  • Check: Since n=7/4 is not an integer, 10 is not in sequence ✓

Common Mistakes

Avoid these frequent errors
  • Assuming any solution means the number is in the sequence
    Don't think that solving 4n+3=10 to get n=7/4 means 10 is in the sequence = wrong conclusion! The value n=7/4 is not a positive integer, so it's invalid for sequences. Always check that n is a positive integer for the term to exist in the sequence.

Practice Quiz

Test your knowledge with interactive questions

12 ☐ 10 ☐ 8 7 6 5 4 3 2 1

Which numbers are missing from the sequence so that the sequence has a term-to-term rule?

FAQ

Everything you need to know about this question

Why does n have to be a positive integer?

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In sequences, n represents the position of a term (1st, 2nd, 3rd, etc.). You can't have a 7/4th term or a negative position, so n must be a positive whole number!

What if I get a decimal when solving for n?

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If you get a decimal or fraction for n, it means that number is not in the sequence. Only whole number positions make sense in sequences.

How do I check if a number is in the sequence 4n+3?

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Set up the equation 4n+3=your number 4n+3 = \text{your number} , solve for n. If n is a positive integer, the number is in the sequence. If not, it isn't!

Can I just plug in numbers to find if 10 is in the sequence?

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You could try n=1, 2, 3... but that's inefficient! It's much faster to solve the equation directly like we did: 4n+3=10.

What are the first few terms of 4n+3?

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When n=1: 4(1)+3=7
When n=2: 4(2)+3=11
When n=3: 4(3)+3=15
Notice 10 isn't there, and it falls between 7 and 11!

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