Definice: Kořen rovnice, též řešení rovnice, je hodnota proměnné (sada hodnot proměnných), pro které je rovnost splněna. Množinu všech kořenů/řešení rovnice značímeK.
Při řešení rovnic používáme ekvivalentní úpravy, to jsou ty, které nezmění množinu kořenů. Tím dostaneme jinou rovnici se stejnou množinou kořenů. Pokud změní, musíme to nějak zohlednit.
Přičtení nebo odečtení stejného čísla a z obou stran rovnice.
Vynásobení obou stran rovnice nějakým číslem a∈R;a=0.
Upravovat algebraické výrazy. x2+2x+1=0⇒(x+1)2=0
Dělit neznámou ve výrazu POZOR, musíme nejprve zohlednit nulovou hodnotu toho, co dělíme: x(x+1)=0⇒x+1=0 bychom přišli o řešení x=0, tedy ho musíme nejdříve zohlednit.
Pokud máme komplikovanější tvar, který je ovšem stále lineární, převedeme na tento případ. Toto platí i u komplikovanějších rovnic, nebudu to již zmiňovat.
Počet kořenů:
Pokud a=0∧b=0, má rovnice nekonečně mnoho řešení (vyjde 0=0⇒K=R).
Pokud a=0∧b=0, rovnice nemá řešení (vyjde b=0⇒K=∅).
Pokud a=0, rovnice má právě jedno řešení.
Řešení pro poslední případ:ax+b=0ax=−bx=−abK={−ab}
x1+x2=2a−b+D+2a−b−D=−abx1⋅x2=2a−b+b2−4ac⋅2a−b−b2−4ac=acV některých případech se dají takto jednoduše tipnout kořeny:x2+5x+6=0x1+x2=−ab=−5x1⋅x2=ac=6x1=−2,x2=−3Z Viètových vzorců vyplývá:(x−x1)(x−x2)=0x2−x(x1+x2)+x1⋅x2=0x2−x⋅(−ab)+ac=0ax2+bx+c=0
Tedy tento zápis kvadratické rovnice je ekvivalentní tomu obecnému.
Obecný tvar: P(x)=0Až do čtvrtého stupně existují vzorce na jednoduché vyřešení.
Základní věta algebry
Každý polynom stupně 1 nebo víc lze rozložit na součin polynomů, z nichž každý má stupeň 1nebo 2.
⇒ Pokud dokážeme tipnout kořen, můžeme z polynomu na levé straně vytknout polynom (x−x0) a snížit tím stupeň o 1.Pokud polynom na levé straně dodržuje koeficienty binomické věty, můžeme rozložit na (x−x0)n.Reciproké rovnice (symetrické či antisymetrické koeficienty) se řeší poměrně jednoduše.Substituce, pokud jsou všechny mocniny násobek nějakého k>1.Average Newtonova numerická metoda zkoušení kořenů.Jinak good luck
Řešíme prakticky stejně, jako jiné rovnice, s tím rozdílem, že musíme někdy rovnici umocnit. Pokud rovnici umocňujeme na sudý stupeň, musíme si buď ověřit, že obě strany rovnice jsou buď obě nezáporné nebo obě záporné, nebo projít všechny možnosti a na konci udělat zkoušku.
Po vyřešení rovnice je vhodné provést zkoušku, abychom si ověřili, zda všechna řešení, co jsme našli, jsou skutečně řešení. Zkoušku provedeme dosazením každého z řešení do rovnice a uvidíme, zda nám vyjde.
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`,_jsxs(_components.span,{className:`katex`,children:[_jsx(_components.span,{className:`katex-mathml`,children:_jsx(_components.math,{xmlns:`http://www.w3.org/1998/Math/MathML`,children:_jsxs(_components.semantics,{children:[_jsxs(_components.mrow,{children:[_jsx(_components.mi,{children:`x`}),_jsx(_components.mo,{children:`=`}),_jsx(_components.mn,{children:`0`})]}),_jsx(_components.annotation,{encoding:`application/x-tex`,children:`x = 0`})]})})}),_jsxs(_components.span,{className:`katex-html`,\"aria-hidden\":`true`,children:[_jsxs(_components.span,{className:`base`,children:[_jsx(_components.span,{className:`strut`,style:{height:`0.4306em`}}),_jsx(_components.span,{className:`mord 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`,_jsxs(_components.span,{className:`katex`,children:[_jsx(_components.span,{className:`katex-mathml`,children:_jsx(_components.math,{xmlns:`http://www.w3.org/1998/Math/MathML`,children:_jsxs(_components.semantics,{children:[_jsxs(_components.mrow,{children:[_jsx(_components.mi,{children:`P`}),_jsx(_components.mo,{stretchy:`false`,children:`(`}),_jsx(_components.mi,{children:`x`}),_jsx(_components.mo,{stretchy:`false`,children:`)`}),_jsx(_components.mo,{children:`=`}),_jsx(_components.mn,{children:`0`})]}),_jsx(_components.annotation,{encoding:`application/x-tex`,children:`P(x) = 0`})]})})}),_jsxs(_components.span,{className:`katex-html`,\"aria-hidden\":`true`,children:[_jsxs(_components.span,{className:`base`,children:[_jsx(_components.span,{className:`strut`,style:{height:`1em`,verticalAlign:`-0.25em`}}),_jsx(_components.span,{className:`mord 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`,_jsxs(_components.span,{className:`katex`,children:[_jsx(_components.span,{className:`katex-mathml`,children:_jsx(_components.math,{xmlns:`http://www.w3.org/1998/Math/MathML`,children:_jsxs(_components.semantics,{children:[_jsx(_components.mrow,{children:_jsx(_components.mn,{children:`1`})}),_jsx(_components.annotation,{encoding:`application/x-tex`,children:`1`})]})})}),_jsx(_components.span,{className:`katex-html`,\"aria-hidden\":`true`,children:_jsxs(_components.span,{className:`base`,children:[_jsx(_components.span,{className:`strut`,style:{height:`0.6444em`}}),_jsx(_components.span,{className:`mord`,children:`1`})]})})]}),`\\xA0nebo víc lze rozložit na součin polynomů, z nichž každý má stupeň\\xA0`,_jsxs(_components.span,{className:`katex`,children:[_jsx(_components.span,{className:`katex-mathml`,children:_jsx(_components.math,{xmlns:`http://www.w3.org/1998/Math/MathML`,children:_jsxs(_components.semantics,{children:[_jsx(_components.mrow,{children:_jsx(_components.mn,{children:`1`})}),_jsx(_components.annotation,{encoding:`application/x-tex`,children:`1`})]})})}),_jsx(_components.span,{className:`katex-html`,\"aria-hidden\":`true`,children:_jsxs(_components.span,{className:`base`,children:[_jsx(_components.span,{className:`strut`,style:{height:`0.6444em`}}),_jsx(_components.span,{className:`mord`,children:`1`})]})})]}),`nebo 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`,_jsxs(_components.span,{className:`katex`,children:[_jsx(_components.span,{className:`katex-mathml`,children:_jsx(_components.math,{xmlns:`http://www.w3.org/1998/Math/MathML`,children:_jsxs(_components.semantics,{children:[_jsx(_components.mrow,{children:_jsx(_components.mn,{children:`1`})}),_jsx(_components.annotation,{encoding:`application/x-tex`,children:`1`})]})})}),_jsx(_components.span,{className:`katex-html`,\"aria-hidden\":`true`,children:_jsxs(_components.span,{className:`base`,children:[_jsx(_components.span,{className:`strut`,style:{height:`0.6444em`}}),_jsx(_components.span,{className:`mord`,children:`1`})]})})]}),`.`]}),`\n`,_jsxs(_components.p,{children:[`Pokud polynom na levé straně dodržuje koeficienty binomické věty, můžeme rozložit na 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