Question

2 inmultit cu x la puterea a 2 a = 18 ;
(x+5):4 mai mic sau egal cu 2

Answer 1

2x²=18 =>x²=9 =>x=3 sau x=-3
(x+5)/4≤2 =>x+5≤8 =>x≤3 =>x∈(-∞,3]

Answer 2

2*x²=18 | :2
x²=9
x=√9
x₁=3 sau x₂= -3

(x+5):4≤2
x+5≤ 8
x≤8-5
x≤3
S= {-∞; 3]