Q. Find the 10th term of the geometric sequence shown below.−3x6,6x10,−12x14,…Answer:
Identify Common Ratio: To find the 10th term of a geometric sequence, we need to identify the common ratio (r) of the sequence. The common ratio is found by dividing any term by the previous term.
Calculate Common Ratio: Let's find the common ratio by dividing the second term by the first term: r=−3x66x10=−2x4
Use Geometric Sequence Formula: Now that we have the common ratio, we can use 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.
Determine First Term and Term Number: The first term a1 is −3x6, the common ratio r is −2x4, and we want to find the 10th term (n=10).
Plug Values into Formula: Plugging the values into the formula, we get:a10=a1⋅r10−1=−3x6⋅(−2x4)9
Calculate Exponentiation: Now we need to calculate (−2x4)9. When we raise a power to a power, we multiply the exponents:(−2x4)9=(−2)9×(x4)9=−512×x36
Calculate 10th Term: Substitute this back into the formula for the 10th term:a10=−3x6×(−512×x36)=1536×x42
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