Question

Rezolvati in N ecuatiile: a) 5x-125=0; b) 3x+7=0.

Answer 1

$a)5x - 125 = 0$

$5x = 125 \: | \div 5$

$x = 25 \: \in \: \mathbb{N}$

$b)3x + 7 = 0$

$3x = - 7$

$x =- \frac{7}{3} \: \notin \: \mathbb{N}$

Answer 2

a) 5x - 125 = 0

5x = 125

x = 125 : 5

x = 25 ∈ N

b) 3x + 7= 0

3x = -7

x = -7 : 3

x = -7/3 ∉ N