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Indicate a general rule for the n^(th) term of this sequence. -6a, -3a, 0a, 3a, 6a. . . A.] a_(n)=3an+9a B.] a_(n)=-3an-9a C.] a_(n)=-3an+9a D.] a_(n)=3an-9a
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Indicate a general rule for the n^(th) term of this sequence. -6a, -3a, 0a, 3a, 6a. . . A.] a_(n)=3an+9a B.] a_(n)=-3an-9a C.] a_(n)=-3an+9a D.] a_(n)=3an-9a
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Dec 25, 2019
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Indicate a general rule for the
term of this sequence.
-6a, -3a, 0a, 3a, 6a. . .
A.]
B.]
C.]
D.]
Mathematics
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Pingoo
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Answer: option D) An = 3an - 9a
Justification:
1) That is an arithmetic sequence which you prove by determining the difference between two consecutive terms (which shall be constant if it indeed is an arithmetic sequence):
2)
Second term - first term = -3a - (-6a) = -3a + 6a = 3a
Third term - second term = 0a - (-3a) = 3a
Fourth term - third term = 3a - 0a = 3a
Fith term - fourth term = 6a - 3a = 3a
Therefore, it is an arithmetic sequence with difference d = 3a.
3) the general rule for the nth term of an arithmetic sequence is given by the formula:
An = Ao + d (n - 1)
Where Ao = -6a and d, as determined above, is 3a
=> An = -6a + 3a (n - 1)
Expand the parenthesis (distributive property) =>
An = -6a + 3an - 3a = -9a + 3an =
3an - 9a = option D. <------- answer.
Infinito
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Dec 31, 2019
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Infinito
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