Question

Помогите решить пожалуйста

Answer 1

1) 7; 14; 21; 28; 35

2)

$x_{n} =8n^{2} -1\\x_{1} = 8-1 = 7\\x_{7} = 8*7^{2}-1=8*49-1=392-1=391\\x_{m}= 8m^{2}-1 \\x_{2m}=16m^{2}-1$

3)

$b_{n} =-38+3n, b_{n} = -2, n-?\\-38+3n=-2\\3n=-2+38\\3n=36\\n = 12$

Ответ: 12

4)

$x_{1} =-7, x_{n+1}=5x_{n}-1\\x_{2}=5x_{1}-1=5*(-7)-1=-36\\x_{3}=5x_{2}-1=5*(-36)-1=-181\\x_{4}=5x_{3}-1=5*(-181)-1=-906$

5)$x_{n}=13n+2$