Video: Yuav ua li cas koj pom ib tug nyob rau hauv ib tug quadratic muaj nuj nqi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov quadratic muaj nuj nqi f(x) = a(x - h)2 + k, tsis sib npaug rau xoom, yog hais tias nyob rau hauv cov qauv. Yog tias qhov zoo, daim duab qhib rau sab saud, thiab yog tias qhov tsis zoo, ces nws qhib downward. Txoj kab ntawm symmetry yog kab x = h, thiab lub vertex yog qhov taw tes (h, k).
Yog li ntawd, dab tsi yog A nyob rau hauv lub quadratic equation?
Hauv algebra, a quadratic equation (los ntawm Latinquadratus rau "square") yog ib qho kev sib npaug muaj daim foos.qhov twg x sawv cev rau qhov tsis paub, thiab a, b, thiab c sawv cev rau cov lej paub, nrog ≠ 0. Yog tias a = 0, ces qhov kev sib npaug islinear, tsis plaub fab , raws li tsis muaj lub sij hawm.
Tsis tas li ntawd, koj yuav ua li cas thiaj nrhiav tau tus parabola? Parabolas ib txwm muaj qhov qis tshaj plaws (los yog qhov siab tshaj plaws, yog tias parabola yog upside-down). Qhov no point, qhov twg cov parabola hloov kev taw qhia, hu ua "vertex". Yog hais tias lub quadratic sau nyob rau hauv daim ntawv y = a(x –h)2 + k, ces lub vertex yog qhov point (h, k).
Tib neeg kuj nug, dab tsi yog 3 daim ntawv ntawm kev ua haujlwm quadratic?
Thaum feem ntau ntawm txoj kev los sau cov plaub fab kev sib npaug yog redundant thiab useless, muaj peb daim ntawv uas yeej muaj kev siv tshwj xeeb. Cov no peb lub ntsiab daim ntawv uas peb graph parabolas los yog hu ua standard daim ntawv , cuam tshuam daim ntawv thiab vertex daim ntawv.
A hauv vertex yog dab tsi?
Cov vertex daim ntawv ntawm ib lub quadratic yog muab los ntawm. y = a(x – h)2 + k, qhov twg (h, k) yog qhov vertex . Qhov "a" hauv vertex daim ntawv yog tib "a" as. y = ax2 + bx + c (uas yog, ob qho tib si a muaj qhov zoo ib yam). Daim paib ntawm "a" qhia koj seb lub quadratic opens oropens.
Pom zoo:
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