Question

Determinati in fiecare caz:a).(2•x+1)|7.

Answer 1

a)(2*x+1)se divide cu7 rezulta 2*x+1 apartine multimii divizorilor lui 7;(1,7,-1,-7)
2*x+1=1,2*x=0,x=0
2*x*1=7,2*x=6,x=3
2*x+1=-1,2*x=0,x=0
2*x+1=-7,2*x=-6,x=-3
raspuns x apartine(0,3,-3)