SOLUTION: The second term of a GP is 4, the fifth term is 81. Find the seventh term
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Question 1154077: The second term of a GP is 4, the fifth term is 81. Find the seventh term
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
he second term of a GP is 4, the fifth term is 81. Find the seventh term
we need to find first term and common ratio
using nth term formula of a GP :
where is first term, is common ratio, and is a number of terms
given:
....eq.1
....eq.2
from eq.1 and eq.2 we have
....take to fourth power
go to
....eq.1, substitute
7th term: n=7
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