Question

Va rog ajutatima!


(2x-1) | 7

Answer 1

2x - 1 = 7

2x = 7 + 1

2 x = 8

x = 8 : 2

x = 4

Verific : 2 × 4 - 1 = 7 care e divizibil cu 7

Answer 2

(2x-1) I 7

2x-1 =7 => 2x = 8 => x = 4

Generalizind , x = 4k (multiplu de 4) ; unde k ∈ N

2x-1 = -7 => x = -3 ; x = - 3k (multiplu de -3) ; unde k ∈ N