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66 SeadgineT kvadratuli gantoleba, romelsac mxolod erTi, miTiTebuli<br />
fesvi aqvs:<br />
a) 5; b) ; g) –2 ; d) 1<br />
7 .<br />
67. daSaleT mamravlebad Semdegi samwevri:<br />
a) x2 +5a+6a 2 ; b) –x 2 –6x–9; g) x2 –6x–7;<br />
d) x2 +6x–91; e) x2 –ax–2a 2 ; v) 2x 2 +8x–90.<br />
68. SekveceT wiladi:<br />
a) b2 + 6b – 91<br />
b2 ; b)<br />
+ 8b – 105<br />
3a 2 – 3x – 6<br />
12a 2 – 36a + 24 ;<br />
g) x2 – 9xy + 14y 2<br />
x 2 – xy – 2y 2 ; d) 6x2 – 7x – 3<br />
2x 2 – x – 3 .<br />
69 x 2 +4x+q=0 gantolebis fesvebis sxvaoba 6-is tolia. ipoveT q.<br />
70 x da x x 1 2 2 –3x+1=0 gantolebis fesvebia. ipoveT:<br />
a) 5<br />
x<br />
+<br />
1<br />
5<br />
x<br />
;<br />
2<br />
b) 5<br />
2 x1 + 5<br />
2 x<br />
;<br />
2<br />
g) 5<br />
3 x1 + 5<br />
3 x<br />
.<br />
2<br />
71 Tu x da x aris 3x 1 2 2 +45x+16=0 gantolebis fesvebi. ipoveT 5 5<br />
+<br />
3|x | 3|x | 1 2 .<br />
72 SeadgineT kvadratuli gantoleba, romlis fesvebi 2-jer meti iqneba<br />
x 2 –5x–1=0 gantolebis fesvebze.<br />
73 SeadgineT axali kvadratuli gantoleba, romlis TiToeuli fesvi<br />
2-iT meti iqneba x2 +3x–2=0 gantolebis fesvebze.<br />
74 gansazRvreT a-s mniSvneloba, romlisaTvisac a2 +a(x–1)=2+ 7<br />
2x gantolebas<br />
aqvs moduliT toli da niSniT gansxvavebuli fesvebi.<br />
75 ipoveT a-s mniSvneloba, romlisaTvisac 7x 2 –a(x–1)=7 gantolebis<br />
2 2 fesvebi akmayofilebs pirobas: x + x = x + x2 .<br />
1 2 1<br />
76 x 2 +px+35=0 gantolebis fesvebis jami fesvebis namravlze 23-iT naklebia.<br />
ipoveT p da gantolebis fesvebi.<br />
77 ipoveT 3x2 +<br />
1+x1 3x1 , Tu x da x aris x<br />
1+x 1 2<br />
2<br />
2 –3x+1=0 gantolebis fesvebi.<br />
55