Question

Решите двойное неравенство
-9 ≤ 2х+1 ≤ 10

а)(-5; 4,5)
б) [-4; 6,5]
в) [-10;9 ]
г) [-5;4,5 ]

Answer 1

-9 ≤ 2х+1 ≤ 10   |-1
-9-1 ≤ 2х+1-1 ≤ 10-1
-10 ≤ 2х ≤ 9      |:2
-5 ≤ х ≤ 4.5