= V ( 8 * 12 ) \ V 6 = V 96 \ V 16 = V ( 96\6) = V 16 = 4
.................................................
X² -6x =14x -18 -x²
x² -6x -14x +18 +x² =0
2x² -20x +18 =0
D=b²-4ac(a=2,b= -20,c=18)
D =400 -144 =256 =16²
x1,x2=(-b+-корень изD)/2a
x1=(20 -16)/4 =1
x2=(20 +16)/4 =9
(6-х)(3х+12)≤0
3(6-х)(х+4)≤0
-3(x-6)(x+4) ≤0
(x-6)(x+4)≥0
+ - +
-----*--------*-------->x
-4 6
Ответ х∈(-∞; -4]U[6;+∞)
-(x-2)(9-x)(x+10)>0
(x-2)(x-9)(x+10)<0
- + - +
---o-----o----o----->x
-10 2 9
x∈(-∞; -10)U(2; 9)
(5x+7) (8-x) >0
-(5x+7)(x-8)>0
(5x+7)(x-8)<0
+ - +
----o--------o------>x
-7/5 8
-1.4
x∈(-1.4; 8)