what is the first term of a geometric sequence if the sixth is 128 and the common ratio is -2?
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what is the first term of a geometric sequence if the sixth is 128 and the common ratio is -2?
what is the first term of a geometric sequence if the sixth is 128 and the common ratio is -2?
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Answer:
160
Step-by-step explanation:
An=a1(r)n-1
128=a1(-2)6-1
128=a1(-2)5
128=a1(-32)
128+32=a1
160=a1