10. What is the eighth of the regular numbers x ^ 1, 2x ^ 2, 3x ^ 6, 5x ^ 18, 8x ^ 54, 13X ^ 162 X，X^1，2X^2，3X^4，5X^8，8X^16,13x^32

10. What is the eighth of the regular numbers x ^ 1, 2x ^ 2, 3x ^ 6, 5x ^ 18, 8x ^ 54, 13X ^ 162 X，X^1，2X^2，3X^4，5X^8，8X^16,13x^32

X,X^1,2X^2,3X^6,5X^18,8X^54,13X^162,21X^486
The coefficient is Fibonacci series, and the index is three times of the previous index

Factorization factor X ^ 3-3x ^ 2-13x + 15 2x ^ 3-8x-3 x ^ 4-2x ^ 3-16x ^ 2 + 2x + 15
x^3-3x^2-13x+15
2x^3-8x-3
x^4-2x^3-16x^2+2x+15
Here are three questions.

Rewrite to (x ^ 3-3x ^ 2 + 2x) - (15x-15)
(x^3-9x)+(x-3)
(x^4-2x^3-15x^2)-(x^2-2x-15)

Solving equation: 4 + 6 times (3x-2) = 16x 13x-4 times (2x + 5) = 2 times (x + 11)

X=4 X=14