Lub cubic muaj nuj nqi ua li cas?
Lub cubic muaj nuj nqi ua li cas?

Video: Lub cubic muaj nuj nqi ua li cas?

Video: Lub cubic muaj nuj nqi ua li cas?
Video: koj xav muaj peev nyiaj yuav tsim li cas? peev los qhov twg los? clip no muaj lus teb (05) 2024, Kaum ib hlis
Anonim

Kev sib npaug ntawm daim ntawv no thiab muaj nyob rau hauv puab ntawm parabola, thiab txij li b yog qhov zoo, nws nce mus rau txhua sab ntawm lub vertex. Ua si nrog ntau yam txiaj ntsig ntawm b. Raws li b tau loj dua lub parabola tau steeper thiab 'narrower'. Thaum b yog qhov tsis zoo nws nqes downwards txhua sab ntawm lub vertex.

Ntawm no, dab tsi yog qhov cubic function graph hu ua?

A kub function (a.k.a. thib peb-degree polynomial muaj nuj nqi ) yog ib qho uas tuaj yeem sau rau hauv daim ntawv. f(x) = ax3 + bx2 + cx + d. (1) Quadratic muaj nuj nqi tsuas yog tuaj nyob rau hauv ib qho yooj yim duab, ib tug parabola. Lub parabola tuaj yeem ncab lossis compressed.

Ib sab saum toj no, lub cubic cag muaj nuj nqi zoo li cas? Basic Square Root thiab Cube Root Functions A square root muaj nuj nqi yog a muaj nuj nqi nrog qhov sib txawv hauv qab square cag . Ib yam li ntawd, a kub root function yog a muaj nuj nqi nrog qhov sib txawv hauv qab kub root . Qhov yooj yim tshaj plaws ntawm cov no muaj nuj nqi yog √(x) thiab 3√(x), feem.

Ua raws li qhov kev pom no, koj ua li cas sau lub cubic muaj nuj nqi?

A kub function muaj cov qauv ntawm f(x) = ax3 + bx ib2 + cx + d. Qhov "basic" kub function yog f(x) = x3. Koj tuaj yeem pom nws hauv daim duab hauv qab no. Hauv ib kub function , lub zog siab tshaj ntawm x sib txawv (s) yog 3.

Qhov piv txwv cubic function yog dab tsi?

A kub function yog ib qho muaj nuj nqi ntawm daim ntawv y = ax^3 + bx^2 + cx + d, qhov twg a, b, c, thiab d yog qhov tsis tu ncua, thiab a tsis sib npaug rau xoom, lossis a polynomial ua haujlwm nrog lub siab tshaj plaws exponent sib npaug 3. Cov hom ntawm muaj nuj nqi muaj ntau heev nyob rau hauv daim ntawv thov uas muaj ntim.

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