Dab tsi yog qhov x cuam tshuam ntawm lub quadratic txhais tau li cas?
Dab tsi yog qhov x cuam tshuam ntawm lub quadratic txhais tau li cas?

Video: Dab tsi yog qhov x cuam tshuam ntawm lub quadratic txhais tau li cas?

Video: Dab tsi yog qhov x cuam tshuam ntawm lub quadratic txhais tau li cas?
Video: Kuv Hmoov Phem Los Koj Siab Phem-LOKY(Official MV ) 2024, Kaum ib hlis
Anonim

Cov cag tseem hu ua x - cuam tshuam los yog zeros. A plaub fab muaj nuj nqi yog graphically sawv cev los ntawm ib tug parabola nrog vertex nyob rau hauv lub hauv paus chiv keeb, hauv qab no x -axis, los yog saum toj no x -axis. Lub hauv paus ntawm kev ua haujlwm yog qhov x - cuam tshuam . Los ntawm txhais , lub y-coordinate ntawm cov ntsiab lus dag ntawm lub x - axis yog xoom.

Hauv txoj kev no, X cuam tshuam dab tsi ntawm daim duab ntawm lub quadratic muaj nuj nqi?

Cov x - cuam tshuam yog cov ntsiab lus uas tus parabola hla tus x -axis. Yog tias lawv muaj, cov x - cuam tshuam sawv cev zeros, los yog cov hauv paus hniav, ntawm cov quadratic muaj nuj nqi , tus nqi ntawm x koj y=0. Tej zaum yuav muaj xoom, ib, lossis ob x - cuam tshuam.

Dab tsi yog A hauv vertex daim ntawv? y = a(x – h)2 + k, qhov twg (h, k) yog qhov vertex . Qhov "a" hauv qhov vertex daim ntawv yog tib "a" as. hauv y = ax2 + bx + c (uas yog, ob qho tib si a's muaj qhov zoo ib yam). Daim paib ntawm "a" qhia koj seb lub quadratic qhib lossis qhib.

Tsis tas li ntawd, dab tsi yog tus sawv cev hauv kev sib npaug plaub npaug?

Hauv algebra, a quadratic equation (los ntawm Latin quadratus rau "square") yog ib qho kev sib npaug uas tuaj yeem hloov kho nyob rau hauv daim ntawv txheem raws li. qha x sawv cev ib tug tsis paub, thiab a, b, thiab c sawv cev paub cov lej, qhov twg a ≠ 0. Yog tias a = 0, ces tus kev sib npaug yog linear, tsis yog plaub fab , raws li tsis muaj. lub sij hawm.

Yuav ua li cas koj ua ib qho kev sib npaug ntawm ib daim duab?

Rau sau ib qho kev sib npaug nyob rau hauv daim ntawv nqes hav-intercept, muab a daim duab ntawm qhov ntawd kev sib npaug , xaiv ob lub ntsiab lus ntawm kab thiab siv lawv los nrhiav txoj kab nqes. Qhov no yog tus nqi ntawm m nyob rau hauv lub kev sib npaug . Tom ntej no, nrhiav cov kev tswj hwm ntawm y-intercept--qhov no yuav tsum yog ntawm daim ntawv (0, b). Tus y-coordinate yog tus nqi ntawm b nyob rau hauv lub kev sib npaug.

Pom zoo: