Question

Determina numarul natural x, care verifica relatia: a) (x+1)|9; b) (2x+1)|25

Answer 1

a) (x+1)|9

x+1€{1,3,9}

x€{0,2,8}

b) (2x+1)|25

2x+1€{1,5,25}

2x€{0,4,24}

x€{0,2,12}