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4 kvadratuli<br />

gantolebis grafikuli<br />

amoxsna<br />

1. kvadratuli formis yvavilnars 1m siganis zoli<br />

miuerTes. miRebuli nakveTis farTobi 6 m 2 -ia.<br />

ipoveT Tavdapirveli nakveTis gverdis sigrZe.<br />

amoxsna:<br />

vTqvaT, Tavdapirveli nakveTis gverdis sigrZe x m<br />

iyo, maSin miRebuli marTkuTxa nakveTis farTobi<br />

iqneba x(x+1). miviReT gantoleba:<br />

x(x + 1) = 6<br />

x 2 + x – 6 = 0<br />

miRebul gantolebas kvadratul gantolebas uwodeben.<br />

ax 2 +bx+c=0 saxis gantolebas, sadac a,b,c∈R, a≠0, xolo x<br />

ucnobia, kvadratuli gantoleba ewodeba .<br />

a-s kvadratuli gantolebis pirvel koeficients uwodeben,<br />

b-s _ meore koeficients, xolo c-s _ mesame koeficients<br />

(<strong>Tavi</strong>sufal wevrs).<br />

amovxsnaT grafikulad ax 2 + bx + c = 0, a ≠ 0 (1) gantoleba.<br />

I. (1) gantolebas mivceT x2 = kx + m saxe.<br />

(ax2 + bx + c = 0) ⇔ |:a<br />

(x2 + b c<br />

x +<br />

a a = 0) ⇔ (x2 = – b c<br />

x –<br />

a a )<br />

Tu – b c<br />

≡ k da – ≡ m,<br />

a a<br />

maSin miviRebT x2 = kx + m.<br />

II. erTsa da imave marTkuTxa<br />

sakoordinato sistemaSi avagoT<br />

y = x 2 da y = kx + m funqciaTa<br />

grafikebi.<br />

magaliTad,<br />

x 2 = _0,5x + 1,5<br />

(x 2 = –0,5x +1,5) ⇔<br />

x = –1,5<br />

x =1<br />

III. grafikebis gadakveTis<br />

wertilTa abscisebi iqneba (1)<br />

gantolebis amonaxsnebi.<br />

ramdeni saerTo wertili<br />

SesaZlebelia hqondes<br />

wrfesa da parabolas?<br />

parabolas wrfesTan<br />

SesaZlebelia hqondes:<br />

I. ori saerTo<br />

wertili<br />

II. erTi saerTo<br />

wertili<br />

III. arc erTi saerTo<br />

wertili<br />

25

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