Q. Find the 9th term of the geometric sequence shown below.−x5,−x9,−x13,…Answer:
Identify Common Ratio: To find the 9th term of a geometric sequence, we need to identify the common ratio (r) between consecutive terms. We can find the common ratio by dividing the second term by the first term.Calculation: r=(−x9)/(−x5)=x9−5=x4
Calculate 9th Term: Now that we have the common ratio r=x4, we can find the 9th term a9 using the formula for the nth term of a geometric sequence: an=a1⋅r(n−1), where a1 is the first term and n is the term number.Calculation: a9=(−x5)⋅(x4)9−1=(−x5)⋅(x4)8
Simplify Exponent: Next, we simplify the expression for a9 by calculating (x4)8.Calculation: (x4)8=x(4∗8)=x32
Multiply to Find 9th Term: Now we can multiply the first term by x32 to find the 9th term.Calculation: a9=(−x5)×x32=−x5+32=−x37
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