Question

Solutia in Z a inecuatiei 3(x+1)<-18 este....
Rezolvand in Z inecuatia 2(x+5)+3 < sau egal cu -9 obtinem solutia.......

Answer 1

$a).3(x+1)\ \textless \ -18 \\ 3x+3\ \textless \ -18 \\ 3x\ \textless \ -18-3 \\ 3x\ \textless \ -21 \\ x\ \textless \ \frac{-21}{3} \\ x\ \textless \ -7 \\ b).2(x+5)+3 \leq -9 \\ 2x+10+3 \leq -9 \\ 2x \leq -9-10-3 \\ 2x \leq -22 \\ x \leq \frac{-22}{2} \\ x \leq -11$