Q. Find the 7th term of the geometric sequence shown below.x4,−3x7,9x10,…Answer:
Find Common Ratio: To find the 7th term of the geometric sequence, we first need to determine the common ratio (r) of the sequence. The common ratio can be found by dividing any term by the previous term.Let's divide the second term by the first term to find the common ratio.r=x4−3x7r=−3x7−4r=−3x3
Calculate 7th Term: Now that we have the common ratio, we can find the 7th term a7 using the formula for the nth term of a geometric sequence, which is an=a1⋅r(n−1), where a1 is the first term and n is the term number.The first term a1 is x4, the common ratio r is −3x3, and we want to find the 7th term n=7.a7=x4⋅(−3x3)(7−1)an=a1⋅r(n−1)0
Simplify Expression: Now we need to simplify the expression for the 7th term.a7=x4⋅(−3)6⋅(x3)6a7=x4⋅729⋅x18a7=729⋅x4+18a7=729⋅x22
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