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Find the 9th term of the geometric sequence shown below.

-x^(5),-x^(9),-x^(13),dots
Answer:

Find the 99th term of the geometric sequence shown below.\newlinex5,x9,x13, -x^{5},-x^{9},-x^{13}, \ldots \newlineAnswer:

Full solution

Q. Find the 99th term of the geometric sequence shown below.\newlinex5,x9,x13, -x^{5},-x^{9},-x^{13}, \ldots \newlineAnswer:
  1. Identify Common Ratio: To find the 99th term of a geometric sequence, we need to identify the common ratio (r)(r) between consecutive terms. We can find the common ratio by dividing the second term by the first term.\newlineCalculation: r=(x9)/(x5)=x95=x4r = (-x^9) / (-x^5) = x^{9-5} = x^4
  2. Calculate 99th Term: Now that we have the common ratio r=x4r = x^4, we can find the 99th term a9a_9 using the formula for the nth term of a geometric sequence: an=a1r(n1)a_n = a_1 \cdot r^{(n-1)}, where a1a_1 is the first term and nn is the term number.\newlineCalculation: a9=(x5)(x4)91=(x5)(x4)8a_9 = (-x^5) \cdot (x^4)^{9-1} = (-x^5) \cdot (x^4)^8
  3. Simplify Exponent: Next, we simplify the expression for a9a_9 by calculating (x4)8(x^4)^8.\newlineCalculation: (x4)8=x(48)=x32(x^4)^8 = x^{(4*8)} = x^{32}
  4. Multiply to Find 99th Term: Now we can multiply the first term by x32x^{32} to find the 99th term.\newlineCalculation: a9=(x5)×x32=x5+32=x37a_9 = (-x^5) \times x^{32} = -x^{5+32} = -x^{37}

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