Cov txheej txheem:
Video: Yuav ua li cas los hloov ib tug quadratic kab zauv los ntawm vertex daim ntawv rau lub tshuab xam zauv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lub laij lej rau kev hloov pauv los ntawm daim ntawv yooj yim mus rau daim ntawv vertex
- y = x2 + 3x + 5.
- x2 + 3x + 5 =
- || +(p2)2-(p2)2=0.
- || a2+2ab+b2=(a+b)2.
- || -1⋅-1=+1.
- xS=-32=-1.5.
- yS=-(32)2+5=2.75.
Tom qab ntawd, koj yuav ua li cas hloov qhov sib npaug plaub npaug rau daim ntawv vertex?
Rau hloov a plaub fab los ntawm y = ax2 + bx + c daim ntawv rau vertex daim ntawv y = a(x - h)2+ k, koj siv cov txheej txheem ua kom tiav cov square. Cia peb saib ib qho piv txwv. Hloov y = 2 x2 - 4x + 5 po vertex daim ntawv , thiab hais cov vertex . Equation in y = ax2 + bx + c daim ntawv.
Ib sab saum toj no, dab tsi yog daim foos factored? A factored daim ntawv yog ib tug parenthesized algebraic qhia. Hauv cov nyhuv a factored daim ntawv yog ib yam khoom ntawm sums ntawm cov khoom … los yog ib tug sum ntawm cov khoom ntawm sums … Tej logic muaj nuj nqi yuav sawv cev los ntawm ib tug factored daim ntawv , thiab ib qho factored daim ntawv yog ib tug sawv cev ntawm ib co logic muaj nuj nqi.
Hauv qhov no, dab tsi yog qhov sib npaug los nrhiav qhov vertex?
Parabola ib txwm muaj qhov qis tshaj plaws (los yog qhov siab tshaj plaws, yog tias parabola yog upside-down). Lub ntsiab lus no, qhov twg parabola hloov kev coj, hu ua " vertex ". Yog hais tias lub quadratic sau nyob rau hauv daim ntawv y = a(x – h)2 + k, tom qab ntawd vertex yog lub ntsiab lus (h, k).
Dab tsi yog qhov vertex ntawm parabola?
Cov Vertex ntawm Parabola . Cov vertex ntawm parabola yog qhov point qhov twg parabola hla nws axis ntawm symmetry. Yog hais tias tus coefficient ntawm x2 lub sij hawm yog qhov zoo, lub vertex yuav yog qhov qis tshaj plaws ntawm daim duab, qhov taw tes hauv qab ntawm "U"-zoo li.
Pom zoo:
Yuav ua li cas koj hloov ib tug muaj nuj nqi rau hauv vertex daim ntawv?
Txhawm rau hloov lub quadratic los ntawm y = ax2 + bx + c daim ntawv rau vertex daim ntawv, y = a(x - h) 2 + k, koj siv cov txheej txheem ua kom tiav cov square. Cia peb saib ib qho piv txwv. Hloov y = 2x2 - 4x + 5 rau hauv daim ntawv vertex, thiab hais lub vertex. y = ax2 + bx + c form
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