посчитайте алгебра

1) 9*n - 7

2) 5 * 3^(n-1)

1) x1 = 2   xn= xn-1 + 9

x2 = 2 + 9

x3 = 2 + 9 + 9

xn =2 + 9 * (n -1) = 9*n - 7

2) x1 = 5 xn = 3 * xn-1

x2 = 3 * 5

x3 = 3 * 3 * 5

xn = 5 * 3^(n-1)