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

4x^(4),16x^(7),64x^(10),dots
Answer:

Find the 1212th term of the geometric sequence shown below.\newline4x4,16x7,64x10, 4 x^{4}, 16 x^{7}, 64 x^{10}, \ldots \newlineAnswer:

Full solution

Q. Find the 1212th term of the geometric sequence shown below.\newline4x4,16x7,64x10, 4 x^{4}, 16 x^{7}, 64 x^{10}, \ldots \newlineAnswer:
  1. Identify common ratio: Identify the common ratio (r) of the geometric sequence by dividing the second term by the first term.\newlineCalculation: r=16x74x4=4x3 r = \frac{16x^7}{4x^4} = 4x^3
  2. Use nth term formula: Use the formula for the nth term of a geometric sequence, which is an=a1r(n1) a_n = a_1 \cdot r^{(n-1)} , where a1 a_1 is the first term and n n is the term number.\newlineCalculation: The first term a1 a_1 is 4x4 4x^4 , the common ratio r r is 4x3 4x^3 , and the term number n n is 1212.
  3. Substitute values: Substitute the values into the formula to find the 1212th term.\newlineCalculation: a12=4x4(4x3)11 a_{12} = 4x^4 \cdot (4x^3)^{11}
  4. Simplify expression: Simplify the expression by applying the power to the common ratio.\newlineCalculation: a12=4x4411x33 a_{12} = 4x^4 \cdot 4^{11} \cdot x^{33}
  5. Combine constants and terms: Combine the constants and the like terms.\newlineCalculation: a12=412x(4+33) a_{12} = 4^{12} \cdot x^{(4+33)}
  6. Calculate final value: Calculate the value of 412 4^{12} and simplify the exponent for x x .\newlineCalculation: a12=16777216x37 a_{12} = 16777216 \cdot x^{37}

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