Question

4. Rezolvaţi ecuatiile următoare, unde x e Z: a)x: (-5) = 4; b)x: (-3) = 5; e) x:(-8) = -5; f)x: (-7) = 4; c)x: (-7) = 2; g) X: (4) = -9; d) x : (4) = 7; h) x: (-9) = -3​

Answer 1

$a)x \div ( - 5) = 4 \\ x = 4 \times ( - 5) \\ x = - 20 \\ \\ b)x \div ( - 3) = 5 \\ x = 5 \times ( - 3) \\ x = - 15$

$e)x \div ( - 8) = - 5 \\ x = - 5 \times ( - 8) \\ x = 40$

$f)x \div ( - 7) = 4 \\ x = 4 \times ( - 7) \\ x = - 28$

$c)x \div ( - 7) = 2 \\ x = 2 \times ( -7 ) \\ x = - 14$

$g)x \div ( - 4) = 9 \\ x = 9 \times ( - 4) \\ x = - 36$

$d)x \div ( - 4) = 7 \\ x = 7 \times ( - 4) \\ x= - 28$

$h)x \div ( - 9) = - 3 \\ x = - 3 \times ( - 9) \\ x = 27$