Daisy R.
asked • 04/06/14Find a formula for the arithmetic sequence.
a1=5,d=-4/3
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1 Expert Answer
Steve S. answered • 04/07/14
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Tutoring in Precalculus, Trig, and Differential Calculus
Find a formula for the arithmetic sequence.
a1=5,d=-4/3
5 = 5+0(–4/3),
5+(-4/3) = 5+1(–4/3),
5+(-4/3)+(-4/3) = 5+2(–4/3),
5+2(–4/3)+(–4/3) = 5+3(–4/3),
…
5+(n–1)(–4/3)
a1=5,d=-4/3
5 = 5+0(–4/3),
5+(-4/3) = 5+1(–4/3),
5+(-4/3)+(-4/3) = 5+2(–4/3),
5+2(–4/3)+(–4/3) = 5+3(–4/3),
…
5+(n–1)(–4/3)
Daisy R.
Why this is not righ?
TThis is I did
The common difference is d=-4/3
The initial value is a1=5
C=a1-d=5-(-4/3)=19/3
an=dn+c
=-4/3n+19/3
Report
04/07/14
Steve S.
d = -4/3 is right
a1 = 5 is right
So the term numbers (1st line) and sequence will be:
1, 2, 3, 4, …, n
5, 5+1(-4/3), 5+2(-4/3), 5+3(-4/3), …, 5+(n-1)(-4/3).
See these articles for more help:
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
http://www.purplemath.com/modules/series3.htm
http://www.wyzant.com/resources/lessons/math/precalculus/series_and_sequences/arithmetic_progression
a1 = 5 is right
So the term numbers (1st line) and sequence will be:
1, 2, 3, 4, …, n
5, 5+1(-4/3), 5+2(-4/3), 5+3(-4/3), …, 5+(n-1)(-4/3).
See these articles for more help:
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
http://www.purplemath.com/modules/series3.htm
http://www.wyzant.com/resources/lessons/math/precalculus/series_and_sequences/arithmetic_progression
Report
04/07/14
Daisy R.
Oooo thank you :)
Report
04/07/14
Katy M.
that is not the answer to -4*3
Report
10/26/15
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Daisy R.
04/07/14