Question

Aflati x € N daca: b) (x+1)|(2x+5)
Va rog frumos ​

Answer 1

Explicație pas cu pas:

(x+1) | (2x+5) <=> (x+1) | (2x+2+3) <=> (x+1) | [2(x+1)+3]

(x+1) | 2(x+1) => (x+1) | 3 => (x+1) ∈ {1; 3}

x + 1 = 1 => x = 0

x + 1 = 3 => x = 2

=> x ∈ {0; 2}