The solution of inequality is 2 × & # 178; - 3 × - 2 ≤ 1?

The solution of inequality is 2 × & # 178; - 3 × - 2 ≤ 1?

(½)2ײ-3×-2≤1
ײ-3×+9/4≤21/4
(×-3/2)²≤21/4
-√21/2≤×≤√21/2
(3-√21)/2≤×≤(3+√21)/2