I Tavi
I Tavi
I Tavi
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
I<br />
<strong>Tavi</strong><br />
davazustoT!<br />
roca D = 0,<br />
kvadratul<br />
gantoleba aqvs ori<br />
erTmaneTis toli<br />
amonaxseni.<br />
x 1 = x 2 = – b<br />
2a<br />
30<br />
5 kvadratuli gantolebis amoxsna<br />
amocana 1<br />
fotografiul suraTs, zomiT 12sm × 18sm, erTnairi<br />
siganis CarCo aqvs. gansazRvreT CarCos sigane,<br />
Tu misi farTobi suraTis farTobis tolia.<br />
upirveles yovlisa SevniSnoT, rom CarCoiani<br />
suraTis farTobi (ABCD marTkuTxedis farTobi)<br />
toli iqneba CarCos da suraTis farTobebis<br />
jamisa.<br />
amoxsna:<br />
vTqvaT, CarCos sigane x sm-ia, maSin CarCoiani<br />
suraTis zomebi iqneba: AB=18+2x da AD=12+2x,<br />
xolo farTobi ki – S =(18+2x)(12+2x). a.p.T.<br />
ABCD<br />
CarCos farTobi suraTis farTobis tolia,<br />
amitom vwerT gantolebas:<br />
(18 + 2x)(12 + 2x) = 2 · 12 · 18.<br />
((18 + 2x)(12 + 2x) = 2 · 12 · 18) ⇔ (2(9 + x)2(6 + x) – 2 · 12 · 18 = 0) ⇔ |:4<br />
⇔ ((9 + x)(6 + x) – 2 · 3 · 18 = 0) ⇔ (x 2 + 15x + 54 – 108 = 0) ⇔<br />
⇔ (x 2 + 15x – 54 = 0)<br />
miviReT kvadratuli gantoleba, romlis grafikuli amoxsnac,<br />
rogorc viciT, sazogadod, gantolebis miaxloebiT amonaxsens<br />
gvaZlevs. gavecnoT kvadratuli gantolebis amoxsnis analizur<br />
xerxs.<br />
ganvixiloT ax 2 + bx + c = 0, a ≠ 0 (1) sruli kvadratuli gantoleba.<br />
(ax 2 + bx + c = 0) ⇔ |· 4a<br />
⇔ (4a 2 x 2 + 4abx +4ac =0) ⇔ |–4ac<br />
⇔ (4a 2 x 2 + 4abx = –4ac) ⇔ |+b 2<br />
⇔ (4a 2 x 2 + 4abx + b 2 = b 2 – 4ac) | tolobis marcxena mxare sruli kvadratia<br />
⇔ ((2ax + b) 2 = b 2 – 4ac) (2) | miviReT x 2 =m saxis gantoleba. amovxsnaT:<br />
a) Tu b 2 –4ac