Dab tsi ua rau ib qho quadratic?
Dab tsi ua rau ib qho quadratic?

Video: Dab tsi ua rau ib qho quadratic?

Video: Dab tsi ua rau ib qho quadratic?
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Cov daim duab ntawm a plaub fab muaj nuj nqi yog ib tug parabola uas nws axis ntawm symmetry yog parallel rau lub y-axis. Cov coefficients a, b, thiab c hauv qhov sib npaug y = ax2 + bx + c y = a x 2 + b x + c tswj ntau yam ntawm qhov parabola zoo li thaum kos duab.

Tsuas yog li ntawd, koj yuav ua li cas paub yog tias daim duab yog plaub fab?

Yog qhov txawv yog tas li, lub daim duab yog linear. Yog qhov sib txawv tsis tas li tab sis qhov thib ob txheej ntawm qhov sib txawv yog tas li, lub graph yog quadratic . Yog qhov sib txawv ua raws tus qauv zoo ib yam li y-tus nqi, tus daim duab yog exponential. Saib cov piv txwv hauv qab no kom pom tseeb.

Qhov thib ob, daim duab ntawm ib qho kev sib npaug quadratic zoo li cas? Cov graph ntawm ib quadratic muaj nuj nqi yog U-shaped nkhaus hu ua parabola. Nws ua tau tau kos los ntawm plotting kev daws teeb meem rau cov kev sib npaug , los ntawm kev nrhiav lub vertex thiab siv lub axis ntawm symmetry rau cov lus xaiv cov ntsiab lus, los yog los ntawm kev nrhiav cov hauv paus hniav thiab vertex. Tus qauv qauv ntawm a quadratic equation yog.

Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog daim duab plaub?

Cov duab . A plaub fab muaj nuj nqi yog ib daim ntawv f(x) = ax2 + bx + c, qhov twg a, b, thiab c yog cov lej uas tsis sib npaug rau xoom. Cov daim duab ntawm a plaub fab kev ua haujlwm yog qhov nkhaus hu ua parabola. Parabolas tuaj yeem qhib rau sab saud lossis nqes thiab sib txawv hauv "dav" lossis "seepness", tab sis lawv txhua tus muaj tib yam "U" duab.

Ib nrab parabola hu ua dab tsi?

Daim duab ntawm kab zauv y = √x + 2 yog "sab saum toj ib nrab "ntawm. parabola thiab daim duab ntawm kab zauv y = - √x + 2 muab qhov "hauv qab ib nrab ." Graphing Parabolas . Cov duab ntawm quadratic equations (y = ax2 + bx + c) yog npe parabolas.

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