Q. Find the 8th term of the geometric sequence shown below.−4x6,−20x8,−100x10,…Answer:
Identify Common Ratio: To find the 8th term of a geometric sequence, we need to identify the common ratio (r) of the sequence. The common ratio can be 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=−4x6−20x8=5x2
Find 8th Term: Now that we have the common ratio, we can find the 8th term a8 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.
Substitute Values: Substitute the known values into the formula to find the 8th term:a8=(−4x6)×(5x2)8−1a8=(−4x6)×(5x2)7
Calculate 8th Term: Calculate the 8th term:a8=(−4x6)×(57×x2×7)a8=(−4x6)×(78125×x14)
Multiply Terms: Multiply the terms together:a8=−4×78125×x(6+14)a8=−312500×x20
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