11x^2+88x+176=0 | : 11
x^2 + 8x + 16 = 0
x= -4+-√16-16
x= -4
Ответ: -4
1)
3-9х≥0
-9х≥-3
9х≤3
х≤3/9
х≤1/3
<span>2)</span>
5х+3<span>>0</span>
5х<span>>-3</span>
<span>x>-3</span>/5
х<span>>-0,6</span>
=х²-2х+2х-4-х²-4х-4=-4х-8