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Find the 11th term of the geometric sequence shown below.

-6x^(8),18x^(10),-54x^(12),dots
Answer:

Find the 1111th term of the geometric sequence shown below.\newline6x8,18x10,54x12, -6 x^{8}, 18 x^{10},-54 x^{12}, \ldots \newlineAnswer:

Full solution

Q. Find the 1111th term of the geometric sequence shown below.\newline6x8,18x10,54x12, -6 x^{8}, 18 x^{10},-54 x^{12}, \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=18x106x8=3x2 r = \frac{18x^{10}}{-6x^8} = -3x^2
  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: We need to find the 1111th term, so n=11 n = 11 .
  3. Substitute values: Substitute the known values into the formula to find the 1111th term.\newlineCalculation: a11=6x8(3x2)(111) a_{11} = -6x^8 \cdot (-3x^2)^{(11-1)}
  4. Simplify exponent: Simplify the exponent in the formula.\newlineCalculation: a11=6x8(3x2)10 a_{11} = -6x^8 \cdot (-3x^2)^{10}
  5. Calculate power: Calculate the power of 3x2 -3x^2 raised to the 1010th power.\newlineCalculation: (3x2)10=(3)10(x2)10 (-3x^2)^{10} = (-3)^{10} \cdot (x^2)^{10}
  6. Simplify powers: Simplify the powers.\newlineCalculation: (3)10=59049 (-3)^{10} = 59049 and (x2)10=x20 (x^2)^{10} = x^{20}
  7. Multiply by first term: Multiply the simplified powers by the first term to get the 1111th term.\newlineCalculation: a11=6x859049x20 a_{11} = -6x^8 \cdot 59049 \cdot x^{20}
  8. Combine x terms: Combine the x terms by adding the exponents.\newlineCalculation: a11=659049x8+20 a_{11} = -6 \cdot 59049 \cdot x^{8+20}
  9. Simplify multiplication: Simplify the multiplication to find the 1111th term.\newlineCalculation: a11=659049x28 a_{11} = -6 \cdot 59049 \cdot x^{28}
  10. Calculate product: Calculate the product of 6-6 and 5904959049.\newlineCalculation: a11=354294x28 a_{11} = -354294 \cdot x^{28}

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