What is the sum of the geometric sequence 1,3,9... if there were 11 terms?
1 answer:
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Answer:
Given equation:
when we complete the square , we take half of the value of 8 , then square it, and added to the left sides, we get;
∵8 is the value
Notice that, we add this both sides so that it maintains the equality.
then;
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Simplify:
The number must be added to complete the square is,