Question

Rezolvați in Z ecuațiile
a)7x-14=0
b)4x+12=0
c)-9x+27=0
d)+4x-36=0

Answer 1

$a)7x - 14 = 0$

$7x = 0 + 14$

$7x = 14$

$x = 14 \div 7$

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

$b)4x + 12 = 0$

$4x = 0 - 12$

$4x = - 12$

$x = - 12 \div 4$

$x = - 3\:\in\:\mathbb{Z}$

$c) - 9x + 27 = 0$

$- 9x = 0 - 27$

$- 9x = - 27$

$x = - 27 \div ( - 9)$

$x = 3\:\in\:\mathbb{Z}$

$d)4x - 36 = 0$

$4x = 0 + 36$

$4x = 36$

$x = 36 \div 4$

$x = 9\:\in\:\mathbb{Z}$