Resourcesdown chevron
Testimonials
Plans
Sign in
Sign up
Resourcesright arrow
Testimonials
Plans
Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

Use the initial term and the recursive formula to find an explicit formula for the sequence ana_n. Write your answer in simplest form.\newlinea1=19a_1 = 19\newlinean=an−1−9a_n = a_{n - 1} - 9\newlinean=_____a_n = \_\_\_\_\_

View step-by-step helpView step-by-step help
Homeright chevron icon
Math Problemsright chevron icon
Algebra 2right chevron icon
Convert between explicit and recursive formulasright chevron icon

Full solution

Q. Use the initial term and the recursive formula to find an explicit formula for the sequence ana_n. Write your answer in simplest form.\newlinea1=19a_1 = 19\newlinean=an−1−9a_n = a_{n - 1} - 9\newlinean=_____a_n = \_\_\_\_\_
  1. Initial Term: The initial term is a1=19a_1 = 19.
  2. Recursive Formula: The recursive formula is an=an−1−9a_n = a_{n - 1} - 9. This means each term is 99 less than the previous term.
  3. Explicit Formula: To find the explicit formula, we start with the initial term and apply the recursive formula repeatedly.
  4. Calculate a2a_2: For n=2n=2, a2=a1−9=19−9=10a_2 = a_1 - 9 = 19 - 9 = 10.
  5. Calculate a3a_3: For n=3n=3, a3=a2−9=10−9=1a_3 = a_2 - 9 = 10 - 9 = 1.
  6. Pattern Recognition: We notice that each term is reduced by 99 from the previous term, so the explicit formula will have the form an=a1−9(n−1)a_n = a_1 - 9(n - 1).
  7. Substitute a1a_1: Substitute a1=19a_1 = 19 into the formula: an=19−9(n−1)a_n = 19 - 9(n - 1).
  8. Simplify Formula: Simplify the formula: an=19−9n+9a_n = 19 - 9n + 9.
  9. Combine Like Terms: Combine like terms: an=28−9nan = 28 - 9n.

More problems from Convert between explicit and recursive formulas

Question
Find the sum of the finite arithmetic series. ∑n=110(7n+4)\sum_{n=1}^{10} (7n+4)\newline______
Get tutor helpright-arrow

Posted 2 months ago

Question
Type the missing number in this sequence: `55,\59,\63,\text{_____},\71,\75,\79`
Get tutor helpright-arrow

Posted 1 month ago

Question
Type the missing number in this sequence: `2, 4 8`, ______,`32`
Get tutor helpright-arrow

Posted 2 months ago

Question
What kind of sequence is this? 2,10,50,250,…2, 10, 50, 250, \ldots Choices:Choices:\newline[A]arithmetic\text{[A]arithmetic}\newline[B]geometric\text{[B]geometric}\newline[C]both\text{[C]both}\newline[D]neither\text{[D]neither}
Get tutor helpright-arrow

Posted 2 months ago

Question
What is the missing number in this pattern? 1,4,9,16,25,36,49,64,81,____1, 4, 9, 16, 25, 36, 49, 64, 81, \_\_\_\_
Get tutor helpright-arrow

Posted 1 month ago

Question
Classify the series. ∑n=012(n+2)3 \sum_{n = 0}^{12} (n + 2)^3 \newlineChoices:\newline[A]arithmetic\text{[A]arithmetic}\newline[B]geometric\text{[B]geometric}\newline[C]both\text{[C]both}\newline[D]neither\text{[D]neither}
Get tutor helpright-arrow

Posted 1 month ago

Question
Find the first three partial sums of the series.\newline1+6+11+16+21+26+⋯1 + 6 + 11 + 16 + 21 + 26 + \cdots\newlineWrite your answers as integers or fractions in simplest form.\newlineS1=S_1 = ____\newlineS2=S_2 = ____\newlineS3=S_3 = ____
Get tutor helpright-arrow

Posted 1 month ago

Question
Find the third partial sum of the series. \newline3+9+15+21+27+33+⋯3 + 9 + 15 + 21 + 27 + 33 + \cdots\newlineWrite your answer as an integer or a fraction in simplest form. \newlineS3=S_3 = ____
Get tutor helpright-arrow

Posted 1 month ago

Question
Find the first three partial sums of the series. \newline1+7+13+19+25+31+⋯1 + 7 + 13 + 19 + 25 + 31 + \cdots\newlineWrite your answers as integers or fractions in simplest form. \newlineS1=S_1 = ____\newlineS2=S_2 = ____\newlineS3=S_3 = ____
Get tutor helpright-arrow

Posted 2 months ago

Question
Does the infinite geometric series converge or diverge?\newline1+34+916+2764+⋯1 + \frac{3}{4} + \frac{9}{16} + \frac{27}{64} + \cdots\newlineChoices:\newline[A]converge\text{[A]converge}\newline[B]diverge\text{[B]diverge}
Get tutor helpright-arrow

Posted 1 month ago

View all (37)