Question

Determinati,in fiecare caz,numerele naturale x stiind ca:
a) (2ori x+1)|7
b) (3ori x+1)|16

Answer 1

a) 2x+1|7=>2x+1=>
divizorii lui 7
={1,7}
2x+1 €{1,7} |-1
2x€ {0,6} |:2
x€ {0,3}

b) 3x+1 |16=>3x+1€
divizorii lui 16
={1,2,4,8,16} |-1
3x€{0,1,3,7,15} |:3
x€ {0,1,5}