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Ka hoohalike huinahalike he hoohalike makemakika, e like me keia:
ax2 + bx + c = 0
ʻO kēia ka polynomial papa lua me 3 coefficients:
- a – ka helu kiʻekiʻe (mua), ʻaʻole pono e like me 0;
- b – ʻawelike (ʻelua) coefficient;
- c he mea noa.
ʻO ka hoʻonā ʻana i ka haʻihaʻi quadratic ʻo ka loaʻa ʻana o nā helu ʻelua (kona mau kumu) - x1 a me x2.
Kumu no ka helu ʻana i nā aʻa
No ka huli ʻana i nā kumu o ka haʻihaʻi quadratic, hoʻohana ʻia ke ʻano:
Ua kapa ʻia ka ʻōlelo i loko o ke kumu huinahā hoʻokae a ua kahaia me ka palapala D (a i ʻole Δ):
D = b2 - 4ac
I keia ala, Hiki ke hōʻike ʻia ke kumu no ka helu ʻana i nā aʻa ma nā ʻano like ʻole:
1. Inā D > 0, he 2 kumu o ka hoohalike:
2. Inā D = 0, hoʻokahi wale nō kumu o ka hoohalike:
3. Inā D < 0, вещественных корней нет, но есть комплексные:
Nā hāʻina o nā haʻihaʻi quadratic
Eia 1
3x2 + 5x +2 = 0
Hoʻoholo:
a = 3, b = 5, c = 2
x1 = (-5 + 1) / 6 = -4/6 = -2/3
x2 = (-5 – 1) / 6 = -6/6 = -1
Eia 2
3x2 - 6x +3 = 0
Hoʻoholo:
a = 3, b = -6, c = 3
x1 = x2 = 1
Eia 3
x2 + 2x +5 = 0
Hoʻoholo:
a = 1, b = 2, c = 5
I kēia hihia, ʻaʻohe aʻa maoli, a ʻo ka hopena he helu paʻakikī:
x1 = -1 + 2i
x2 = -1 – 2i
Kiʻikuhi o ka hana quadratic
ʻO ka pakuhi o ka hana quadratic he olelo nane.
f(x) = ax2 + b x + c
- ʻO nā aʻa o ka hoʻohālikelike quadratic nā kiko o ka hui ʻana o ka parabola me ke koʻi abscissa. (X).
- Inā hoʻokahi wale nō kumu, hoʻopā ka parabola i ke koʻi ma kahi kikoʻī me ka hele ʻole ʻana.
- I ka loaʻa ʻole o nā aʻa maoli (ke alo o nā mea paʻakikī), kahi pakuhi me kahi axis X ʻaʻole hoʻopā.