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

4x,-8x^(3),16x^(5),dots
Answer:

Find the 1212th term of the geometric sequence shown below.\newline4x,8x3,16x5, 4 x,-8 x^{3}, 16 x^{5}, \ldots \newlineAnswer:

Full solution

Q. Find the 1212th term of the geometric sequence shown below.\newline4x,8x3,16x5, 4 x,-8 x^{3}, 16 x^{5}, \ldots \newlineAnswer:
  1. Identify common ratio and formula: To find the 12th12^{\text{th}} term of a geometric sequence, we need to identify the common ratio (rr) and use the formula for the nthn^{\text{th}} term of a geometric sequence, which is an=a1r(n1)a_n = a_1 \cdot r^{(n-1)}, where a1a_1 is the first term and nn is the term number.
  2. Find first term: The first term a1a_1 of the sequence is 4x4x.
  3. Calculate common ratio: To find the common ratio rr, we divide the second term by the first term: r=8x34x=2x2r = \frac{-8x^3}{4x} = -2x^2.
  4. Find 1212th term formula: Now that we have the common ratio, we can find the 1212th term a12a_{12} using the formula: a12=a1r(121)=4x(2x2)11a_{12} = a_1 \cdot r^{(12-1)} = 4x \cdot (-2x^2)^{11}.
  5. Calculate exponent: We calculate the exponent: (2x2)11=(2)11×(x2)11=2048x22.(-2x^2)^{11} = (-2)^{11} \times (x^2)^{11} = -2048x^{22}.
  6. Multiply for 1212th term: Now we multiply the first term by the result of the exponent calculation to get the 1212th term: a12=4x×2048x22=8192x23a_{12} = 4x \times -2048x^{22} = -8192x^{23}.

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