Question

determinati nr natural n pt care 2n + 2 este divizor al lui 20

Answer 1

2n+2/20
2x1+2=4
4/20
2x4+2=10
10/20
2x9+2=20
20/20
2x0+2=2
2/20
n∈0,1,4,9,10

Answer 2

2n+2=x,x div. cu 20 D nr 20=1,2,4,5,10,20 Rezulta ca x ={2,4,10,20} N={0,1,4,9}