Solving for the 8th term of a geometric sequence using the formula aₙ = a₁rⁿ⁻¹.
Step-by-step solution for finding the 8th term of a geometric sequence with a₁ = 1, a₂ = 3, a₃ = 9, and n = 8, showing calculation of common ratio r and substitution into the formula aₙ = a₁rⁿ⁻¹.