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Isla'egta afar geesle waa isla'eg xisaabeed, oo guud ahaan sidan u eg:
ax2 + bx + c = 0
Kani waa amar labaad oo kala duwan oo leh 3 iskuxirayaal:
- a Isku-dhafan sare (koowaad), waa inaanu la mid noqon 0;
- b - celceliska (labaad) iskudarka;
- c waa curiye xor ah.
Xalka isla'egta quadratic waa in la helo laba tiro (xididdeeda) - x1 iyo x2.
Formula xisaabinta xididdada
Si loo helo xididada isla'egta quadratic, qaacidada ayaa la isticmaalaa:
Odhaahda gudaha xididka labajibbaaran ayaa loo yaqaan takoorid waxaana lagu calaamadeeyay warqadda D (ama Δ):
D = b2 - 4ac
In sidan, Qaabka loo xisaabiyo xididada waxaa loo matalli karaa siyaabo kala duwan:
1 D > 0, isla'egta ayaa leh 2 xidid:
2 D = 0, isla'egta ayaa leh hal xidid oo keliya:
3 D <0.
Xalka isla'egyada quadratic
Tusaale 1
3x2 + 5x +2 = 0
Go'aanka:
a = 3, b = 5, c = 2
x1 = (-5 + 1) / 6 = -4/6 = -2/3
x2 = (-5 – 1) / 6 = -6/6 = -1
Tusaale 2
3x2 - 6x +3 = 0
Go'aanka:
a = 3, b = -6, c = 3
x1 = x2 = 1
Tusaale 3
x2 + 2x +5 = 0
Go'aanka:
a = 1, b = 2, c = 5
Xaaladdan oo kale, ma jiraan xididada dhabta ah, xalkuna waa tirooyin adag:
x1 = -1 + 2i
x2 = -1 - 2i
Sawirka shaqada quadratic
Jaantuska shaqada afargeesoodka ah waa masaal.
f(x) = ax2 + b x + c
- Xididdada isla'egta quadratic-ka ah waa dhibcaha isgoysyada parabola ee leh dhidibka abscissa (X).
- Haddii uu jiro hal xidid, parabola waxay taabataa dhidibka hal dhibic iyada oo aan la dhaafin.
- Maqnaanshaha xididada dhabta ah (joogitaanka kuwa adag), garaaf leh dhidib X ma taabto.