Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

Find the 9th term of the geometric sequence shown below.

7x^(3),-14x^(8),28x^(13),dots
Answer:

Find the 99th term of the geometric sequence shown below.\newline7x3,14x8,28x13, 7 x^{3},-14 x^{8}, 28 x^{13}, \ldots \newlineAnswer:

Full solution

Q. Find the 99th term of the geometric sequence shown below.\newline7x3,14x8,28x13, 7 x^{3},-14 x^{8}, 28 x^{13}, \ldots \newlineAnswer:
  1. Identify common ratio: Identify the common ratio rr of the geometric sequence by dividing the second term by the first term.\newlineCalculation: r=14x87x3r = \frac{-14x^{8}}{7x^{3}}\newliner=2x5r = -2x^{5}
  2. Verify consistency: Verify the common ratio by dividing the third term by the second term to ensure it is consistent.\newlineCalculation: r=28x1314x8r = \frac{28x^{13}}{-14x^{8}}\newliner=2x5r = -2x^{5}
  3. 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 a1a_1 is the first term and nn is the term number.\newlineCalculation: a9=7x3(2x5)(91)a_9 = 7x^{3} \cdot (-2x^{5})^{(9-1)}
  4. Simplify exponent: Simplify the exponent in the formula.\newlineCalculation: a9=7x3×(2x5)8a_9 = 7x^{3} \times (-2x^{5})^{8}
  5. Calculate power: Calculate the power of the common ratio.\newlineCalculation: (2x5)8=(2)8×(x5)8(-2x^{5})^{8} = (-2)^{8} \times (x^{5})^{8}\newline(2)8=256(-2)^{8} = 256\newline(x5)8=x40(x^{5})^{8} = x^{40}
  6. Multiply first term: Multiply the first term by the power of the common ratio.\newlineCalculation: a9=7x3×256×x40a_9 = 7x^{3} \times 256 \times x^{40}
  7. Combine xx terms: Combine the xx terms by adding the exponents.\newlineCalculation: a9=7×256×x(3+40)a_9 = 7 \times 256 \times x^{(3+40)}\newlinea9=7×256×x43a_9 = 7 \times 256 \times x^{43}
  8. Multiply constants: Multiply the constants to find the 99th term.\newlineCalculation: a9=7×256×x43a_9 = 7 \times 256 \times x^{43}\newlinea9=1792×x43a_9 = 1792 \times x^{43}

More problems from Operations with rational exponents