41
d) mocemuli utoloba tolfasia x(x+5)
x–5 ≥0
utolobis.
pasuxi:
x∈[–5;0]∪(5; +∞).
24
a), b), g) da d) utolobebi amoixsnas klasSi. maTi marcxena nawilebi erTnairia
da es umartivebs moswavles amonaxsnTa simravlisTvis x=5 wertilis mikuTvnebis
sakiTxSi garkvevas. oTxive utolobisTvis SeiZleba erTi RerZi gakeTdes, saTanado
intervalebTan erTad mivuTiToT marcxena mxaris gamosaxulebis niSnebi da amovxsnaT
utolobebi. TiToeul SemTxvevaSi aucileblad Semowmdes yvela sasazRvro wertili:
a) (–∞; –3]∪[4; +∞),
b) (–∞; –3)∪(4; 5)∪(5; +∞),
g) (–3; 4),
d) [–3; 4]∪{5}.
e), v), z) da T) utolobebis marcxena mxare gadavweroT (x–3)(x+1)
2
(x+9) saxiT (3
da –1 aris
x
2
–2x–3 kvadratuli samwevris fesvebi) da amovxsnaT utolobebi a)_d)
utolobebis msgavsad.
25
a) x-is nebismieri mniSvnelobisTvis x
2
+4x+5>0 (x
2
-is koeficienti dadebiTia,
D<0. amave Sedegs mogvcemda samwevris warmodgena aseTi saxiT: (
x+2)
2
+1). amrigad,
sawyisi utoloba tolfasia x
2
+5x+4>0 utolobis. vpoulobT fesvebs: x
1
=–4, x
2
=–1
da vRebulobT: (x+1)(x+4)>0, saidanac intervalTa meTodiT davadgenT amonaxsnTa
simravles:
(–∞; –4)∪(–1; +∞),
b) amovxsnaT (x–6)(x+6)
(x–2)(x+2) <0 utoloba intervalTa meTodiT, miviRebT: (–6; –2)∪(2; 6).
g) martivi gardaqmnebiT vRebulobT mocemulis tolfas utolobas:
–x
2
–4x
(
x+1)(
x–2) >0,
x(
x+4)
(x+1)(x–2) <0.
pasuxi: (–4; –1)∪(0; 2).
d) martivi gardaqmnebiT miviRebT mocemulis tolfas utolobas:
4x
(2x–1)
2
(2x+1) ≥0.
intervalTa meTodiT amoxsnisas vRebu-
lobT:
pasuxi:
(
-∞; - 12
)
∪
[
0; 12
)
∪
(
12; +∞
)
.
26
b) x
2
+x+4 dadebiTia nebismieri x-isTvis (x
2
-is koeficienti dadebiTia, D<0),
amitom gadavdivarT sawyisi utolobidan Semdeg tolfas utolobaze:
(
x+ 32
)(
x– 13
)
≤0. pasuxi:
[
- 32;
1
3
]
.
g) utoloba gadavweroT ase:
2
(
x+3
)(
x– 12
)
1
+
2
(
x+3
)(
x– 32
)
1
>0.
gamartivebiT miviRebT:
(
x+3
)(
x– 12
)(
x– 32
)
x–1
>0,
+
–
+
+
42
saidanac intervalTa meTodiT vRebulobT amonaxsnTa simravles:
(
-∞; - 3
)
∪
(
1
2; 1
)
∪
(
32; +∞
)
.
d) mocemulis tolfasi utolobaa:
1
(x–3)(x–4) -
3
(x–3)(x+3) ≤0,
2
x–15
(x–3)(x–4)(x+3) ≥0.
saidanac, intervalTa meTodiT, vRebulobT amonaxsnaTa simravles:
(–∞; –3)∪(3; 4)∪
[
15
2 ; +∞
)
.
27
a) mocemuli utolobis tolfasia
(
x–1)
2
x ≥0 utoloba.
pasuxi:
(0; +∞).
b) mocemulis tolfasi utolobaa
(
x–1)
2
x >0.
pasuxi: (0; 1)∪(1; +∞).
g) (x–1)
2
x <0
pasuxi: (–∞; 0).
d) (x–1)
2
x ≤0
pasuxi: (–∞; 0)∪{1}.
28
a) utolobis marcxena mxaris gamartivebiT vRebulobT:
x
2
(x–2)–4(x–2)
x(
x–2)
≥0
, (x
2
–4)(x–2)
x(
x–2) ≥0.
cxadia, aq x≠2, amitom (x–2)-ze SekveciT mivi-
RebT
(x–2)(x+2)
x
≥0
, x≠2.
pasuxi: [–2; 0)∪(2; +∞).
b) gamartivebiT miviRebT:
(x
2
+2)(x+2)
x
2
–4
<0, saidanac,
x
2
+2
x–2 <0,
x≠–2.
x
2
+2>0 nebismieri x-isTvis. miviReT,
x–2
<0,
x≠–2.
pasuxi: (–∞; –2)∪(–2; 2).
g) gamartivebiT miviRebT:
3x
(
x+3
)(
x– 23
)
(x
2
+1)(3x–2) ≤0.
x
2
+1>0 nebismieri x-isTvis, amitom miviRebT:
1
x(
x+3) ≤0,
x≠
2
3.
pasuxi:
x∈(–3
;0).