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Find the 7th term of the geometric sequence shown below.

x^(4),-3x^(7),9x^(10),dots
Answer:

Find the 77th term of the geometric sequence shown below.\newlinex4,3x7,9x10, x^{4},-3 x^{7}, 9 x^{10}, \ldots \newlineAnswer:

Full solution

Q. Find the 77th term of the geometric sequence shown below.\newlinex4,3x7,9x10, x^{4},-3 x^{7}, 9 x^{10}, \ldots \newlineAnswer:
  1. Find Common Ratio: To find the 7th7^{\text{th}} term of the geometric sequence, we first need to determine the common ratio (rr) of the sequence. The common ratio can be found by dividing any term by the previous term.\newlineLet's divide the second term by the first term to find the common ratio.\newliner=3x7x4r = \frac{-3x^7}{x^4}\newliner=3x74r = -3x^{7-4}\newliner=3x3r = -3x^3
  2. Calculate 77th Term: Now that we have the common ratio, we can find the 77th term a7a_7 using the formula for the nth 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.\newlineThe first term a1a_1 is x4x^4, the common ratio rr is 3x3-3x^3, and we want to find the 77th term n=7n=7.\newlinea7=x4(3x3)(71)a_7 = x^4 \cdot (-3x^3)^{(7-1)}\newlinean=a1r(n1)a_n = a_1 \cdot r^{(n-1)}00
  3. Simplify Expression: Now we need to simplify the expression for the 77th term.\newlinea7=x4(3)6(x3)6a_7 = x^4 \cdot (-3)^6 \cdot (x^3)^6\newlinea7=x4729x18a_7 = x^4 \cdot 729 \cdot x^{18}\newlinea7=729x4+18a_7 = 729 \cdot x^{4+18}\newlinea7=729x22a_7 = 729 \cdot x^{22}

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