Question

Sa se rezolve in Z ecuatiile... a ) 2x +3=-5 ;,b ) 3 (x-1)=-3 ; c) 4(x+2)=3x-6 ; d) 8x-16=0 ;e ) -4x+2=-30

Answer 1

$a)2x + 3 = - 5$

$2x = - 5 - 3$

$2x = - 8$

$x = - \frac{8}{2}$

$x = - 4 \: \in\: \mathbb{Z}$

$b)3(x - 1) = - 3$

$3x - 3 = - 3$

$3x = - 3 + 3$

$3x = 0$

$x = \frac{0}{3}$

$x = 0 \: \in \: \mathbb{Z}$

$c)4(x + 2) = 3x - 6$

$4x + 8 = 3x - 6$

$4x - 3x = - 6 - 8$

$x = - 14 \: \in \: \mathbb{Z}$

$d)8x - 16 = 0$

$8x = 0 + 16$

$8x = 16$

$x = \frac{16}{8}$

$x = 2 \: \in \: \mathbb{Z}$

$e) - 4x + 2 = - 30$

$- 4x = - 30 - 2$

$- 4x = - 32 \: | \div ( - 4)$

$x = 8 \: \in \: \mathbb{Z}$