Nyob rau hauv lej, lub quadratic yog ib qho hom teeb meem uas cuam tshuam nrog qhov sib txawv ntawm nws tus kheej - kev ua haujlwm hu ua squaringhom lus no muab los ntawm thaj tsam ntawm ib lub square yog nws sab ntev multiplied los ntawm nws tus kheej. Lo lus "quadratic" los ntawm quadratum, lo lus Latin rau square.
txhais li cas thaum qhov sib npaug hu ua quadratic equation?
Nyob hauv algebra, ib qho kev sib npaug plaub npaug (los ntawm Latin quadratus rau "square") yog txhua qhov sib npaug uas tuaj yeem hloov kho hauv daim qauv raws li qhov x sawv cev ib qho tsis paub, thiab a, b, thiab c sawv cev rau cov lej paub, qhov twg a ≠ 0 Yog tias a=0, ces qhov sib npaug yog linear, tsis yog plaub, raws li tsis muaj.term.
Lub ntsiab lus ntawm quadratic quadratic yog dab tsi?
Hauv kev ua lej, lo lus quadratic piav qhia yam uas hais txog squares, rau kev ua haujlwm ntawm squaring, rau cov ntsiab lus ntawm qib thib ob, lossis qhov sib npaug lossis cov qauv uas muaj cov ntsiab lus. Quadratus yog Latin rau square.
Vim li cas nws tsis yog qhov sib npaug plaub npaug?
Examples of NON-quadratic Equations
bx − 6=0 is NOT a quadratic equation because tsis muaj x2 term. x 3 − x2 − 5=0 is NOT a quadratic equation because there is a x3 term (tsis yog tso cai nyob rau hauv quadratic equations).
Introduction to Quadratic Theory (1 of 2: Why we care about quadratics)
