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Find the 8th term of the geometric sequence shown below.

-4x^(6),-20x^(8),-100x^(10),dots
Answer:

Find the 88th term of the geometric sequence shown below.\newline4x6,20x8,100x10, -4 x^{6},-20 x^{8},-100 x^{10}, \ldots \newlineAnswer:

Full solution

Q. Find the 88th term of the geometric sequence shown below.\newline4x6,20x8,100x10, -4 x^{6},-20 x^{8},-100 x^{10}, \ldots \newlineAnswer:
  1. Identify Common Ratio: To find the 8th8^{\text{th}} term of a geometric sequence, we need to identify the common ratio (rr) of the sequence. The common ratio can be found by dividing any term by the previous term.
  2. Calculate Common Ratio: Let's find the common ratio by dividing the second term by the first term: r=20x84x6=5x2r = \frac{-20x^8}{-4x^6} = 5x^2
  3. Find 88th Term: Now that we have the common ratio, we can find the 88th term a8a_8 using the formula for the nth term of a geometric sequence:\newlinean=a1r(n1)a_n = a_1 \cdot r^{(n-1)}\newlinewhere a1a_1 is the first term and nn is the term number.
  4. Substitute Values: Substitute the known values into the formula to find the 8th8^{\text{th}} term:\newlinea8=(4x6)×(5x2)81a_8 = (-4x^6) \times (5x^2)^{8-1}\newlinea8=(4x6)×(5x2)7a_8 = (-4x^6) \times (5x^2)^7
  5. Calculate 88th Term: Calculate the 88th term:\newlinea8=(4x6)×(57×x2×7)a_8 = (-4x^6) \times (5^7 \times x^{2\times7})\newlinea8=(4x6)×(78125×x14)a_8 = (-4x^6) \times (78125 \times x^{14})
  6. Multiply Terms: Multiply the terms together:\newlinea8=4×78125×x(6+14)a_8 = -4 \times 78125 \times x^{(6+14)}\newlinea8=312500×x20a_8 = -312500 \times x^{20}

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