Question

Решите неравенство: |4x - 12| < 8

Answer 1

$\displaystyle |4x-12|<8\\4x-12<9, 4x-12\geq 0; -(4x-12)<8,4x-12<0\\x<5,x\geq 3;x>1,x<3\\x\in [3,5), x\in(1,3)\\x\in(1,5)$