Question

aflati x € N, stiind ca 2x+5/x+1 €N​

Answer 1

Răspuns:

Explicație pas cu pas:

(2x + 5)/(x + 1) = (2x + 2 + 3)/(x + 1) = (2x + 2)/(x + 1) + 3/(x + 1)

= 2(x + 1)/(x + 1) + 3/(x + 1) = 2 + 3/(x + 1)

x + 1 = -1; + 1; -3; + 3

x = -2; 0; -4; +2

x = {0, 2}