Д=64-4×2×8=0
Х1,Х2=-8/4=-2
(b-2)³=b³-6b²+12b²-8=b³+6b²-8
(a-b)³=a³-3a²b+3ab²-b³
-5x+11x-6>0
6x> 6
x> 1
(1;+бесконечность)
X1 *x2=c;
x1+x2=6 {x1+4x2=18; 3x2=12; x2=4; x1+4=6;x2=2
{x1+ x2= 6
6*2=c; c=12
<span>1) t(t+3)>0
t>0 или t+3>0
t>-3
(-∞;-3)U(0;+∞)
</span>2) t(t+8)(t-1.2)≤0
t≤0 или (t+8)≤0 или(t-1.2)≤0
t≤-8 t≤1,2
(-∞;-8]U[0;1,2]