Question

Rezolvati in multimea Z ecuatia:
a) |x| = 18
b) |x| = -2
c) |2x-3| = 7
d) |5-8x| = 35

Answer 1

a)|x| = 18 => sau x=18
Sau x=-18
b)|x|=-2=> multime vida deoarece un nr in modul niciodata nu e negativ
C)|2x-3|=7 => sau 2x-3=7 =>2x=10=>x=5
Sau 2x-3=-7=>2x=-4=>x=-2
D) |5-8x|=35=>sau 5-8x=35=>-8x=30=>x=-3,75
Sau 5-8x=-35 =>8x=-40=>x=-5

Semnu "=>" inseamna "rezulta"

Answer 2

b)|x|=-2
|x|=2
a)|x|=18
|x|=-18