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22-12-2018
Mathematics

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What is the equation for a geometric sequence with a first term of 2 and second term of -8?

What is the equation for a geometric sequence with a first term of 2 and second term of 8 class=

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12AbhishekVerma13 12AbhishekVerma13

22-12-2018

a(1) = 2
r = a(2)/a(1) = -8/2 = -4

[tex]a(n) =a {(r)}^{n - 1} \\ a(n) = 2 {( - 4)}^{n - 1} [/tex]
Answer will be D.

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