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Find the 12th term of the geometric sequence shown below.

2x^(2),4x^(4),8x^(6),dots
Answer:

Find the 1212th term of the geometric sequence shown below.\newline2x2,4x4,8x6, 2 x^{2}, 4 x^{4}, 8 x^{6}, \ldots \newlineAnswer:

Full solution

Q. Find the 1212th term of the geometric sequence shown below.\newline2x2,4x4,8x6, 2 x^{2}, 4 x^{4}, 8 x^{6}, \ldots \newlineAnswer:
  1. Identify Pattern: Identify the pattern in the sequence.\newlineThe given sequence is 2x22x^2, 4x44x^4, 8x68x^6, ...\newlineWe can see that each term is obtained by multiplying the previous term by 2x22x^2.
  2. Determine Common Ratio: Determine the common ratio rr of the sequence.\newlineSince each term is obtained by multiplying the previous term by 2x22x^2, the common ratio rr is 2x22x^2.
  3. Use Formula for nth Term: Use the formula for the nth term of a geometric sequence.\newlineThe nth term ana_n of a geometric sequence can be found using the formula an=a1r(n1)a_n = a_1 \cdot r^{(n-1)}, where a1a_1 is the first term and rr is the common ratio.
  4. Substitute Values: Substitute the values into the formula to find the 12th12^{\text{th}} term.\newlineThe first term a1a_1 is 2x22x^2 and the common ratio rr is 2x22x^2. We want to find the 12th12^{\text{th}} term, so n=12n = 12.\newlinea12=2x2(2x2)121a_{12} = 2x^2 \cdot (2x^2)^{12-1}
  5. Simplify Expression: Simplify the expression for the 1212th term.\newlinea12=2x2×(2x2)11a_{12} = 2x^2 \times (2x^2)^{11}\newlinea12=2x2×211×x2×11a_{12} = 2x^2 \times 2^{11} \times x^{2\times11}\newlinea12=2x2×2048×x22a_{12} = 2x^2 \times 2048 \times x^{22}\newlinea12=4096×x2+22a_{12} = 4096 \times x^{2+22}\newlinea12=4096×x24a_{12} = 4096 \times x^{24}

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