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Find the 10th term of the geometric sequence shown below.

-3x^(6),6x^(10),-12x^(14),dots
Answer:

Find the 1010th term of the geometric sequence shown below.\newline3x6,6x10,12x14, -3 x^{6}, 6 x^{10},-12 x^{14}, \ldots \newlineAnswer:

Full solution

Q. Find the 1010th term of the geometric sequence shown below.\newline3x6,6x10,12x14, -3 x^{6}, 6 x^{10},-12 x^{14}, \ldots \newlineAnswer:
  1. Identify Common Ratio: To find the 1010th term of a geometric sequence, we need to identify the common ratio (r)(r) of the sequence. The common ratio is found by dividing any term by the previous term.
  2. Calculate Common Ratio: Let's find the common ratio by dividing the second term by the first term: r=6x103x6=2x4r = \frac{6x^{10}}{-3x^{6}} = -2x^{4}
  3. Use Geometric Sequence Formula: Now that we have the common ratio, we can use the formula for the nnth 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.
  4. Determine First Term and Term Number: The first term a1a_1 is 3x6-3x^{6}, the common ratio rr is 2x4-2x^{4}, and we want to find the 1010th term (n=10)(n=10).
  5. Plug Values into Formula: Plugging the values into the formula, we get:\newlinea10=a1r101=3x6(2x4)9a_{10} = a_1 \cdot r^{10-1} = -3x^{6} \cdot (-2x^{4})^{9}
  6. Calculate Exponentiation: Now we need to calculate (2x4)9(-2x^{4})^{9}. When we raise a power to a power, we multiply the exponents:\newline(2x4)9=(2)9×(x4)9=512×x36(-2x^{4})^{9} = (-2)^{9} \times (x^{4})^{9} = -512 \times x^{36}
  7. Calculate 1010th Term: Substitute this back into the formula for the 1010th term:\newlinea10=3x6×(512×x36)=1536×x42a_{10} = -3x^{6} \times (-512 \times x^{36}) = 1536 \times x^{42}

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