Nyob rau hauv daim ntawv vertex ntawm lub quadratic, qhov tseeb tias (h, k) yog lub vertex ua rau kev nkag siab yog tias koj xav txog nws ib feeb, thiab nws yog vim qhov ntau "x - h" yog squared, yog li nws tus nqi yog ib txwm xoom lossis ntau dua; ua squared, nws yeej tsis tuaj yeem ua tsis zoo.
Puas qhov vertex ib txwm zoo?
Parabolas ib txwm muaj qhov qis tshaj plaws (lossis qhov siab tshaj plaws, yog tias parabola yog upside-down). Lub ntsiab lus no, qhov twg parabola hloov kev coj, hu ua "vertex". … Qhov squared yeej ib txwm zoo (rau sab xis-up parabola), tshwj tsis yog nws yog xoom.
Koj paub li cas yog qhov vertex zoo lossis tsis zoo?
Yog tias qhov zoo, lub parabola qhib los yog mus rau sab xis. Yog tias nws yog tsis zoo, nws qhib lossis rau sab laug. Lub vertex yog ntawm (h, k).
Thaum A tsis zoo lub vertex ntawm parabola yog ib?
Nyob rau hauv rooj plaub no tus vertex yog qhov siab tshaj plaws, lossis qhov siab tshaj plaws, ntawm parabola. Ib zaug ntxiv, tus nqi tsis zoo loj ntawm qhov ua rau tus parabola nqaim; tus nqi ze rau xoom ua rau nws dav. Rau ib qho kev sib npaug hauv cov qauv, tus nqi ntawm c muab y-intercept ntawm daim duab.
Dab tsi yog qhov vertex ntawm lub quadratic muaj nuj nqi nrog tus nqi tsis zoo?
Yog tias qhov zoo, ces tus parabola ntsej muag (ua kom zoo li koj). Yog hais tias ib tug tsis zoo, ces tus parabola ntsej muag (upside down u). 2. Vertex tuaj yeem pom los ntawm x=−b2a thiab tom qab ntawd ntsaws rau tus nqi kom pom y.
