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slavikrds [6]
3 years ago
13

How do I find the first four terms of this geometric sequence a1=3 and r=-3

Mathematics
1 answer:
Nataliya [291]3 years ago
5 0
A(n)= -1(-3^n)


3 , -9 , 27 , -81
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Which of the following expressions is equal to 3x^2 + 27
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Factor: 
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= (3x)(x) + (3x)(3i) + (9i)(x) + (9i)(3i)
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B) (3x - 9i)(x + 3i)
= (3x +  - 9i)(x + 3i)
= (3x)(x) + (3x)(3i) + ( - 9i)(x) + (- 9i)(3i)
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C) (3x - 6i)(x + 21i)
= (3x +  - 6i)(x + 21i)
= (3x)(x) + (3x)(21i) + (- 6i)(x) + ( -6i)(21i)
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D) (3x - 9i)(x - 3i)
=  (3x +   - 9)(x +  - 3)
= (3x)(x) + (3x)( - 3i) + (- 9)(x) + ( - 9)( - 3i)
= 3x^2 - 9ix - 9x + 27i
= 9ix + 3x^2 + 27i - 9x









Hope that helps!!!

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see below

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