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Nilai x → ∞ lim ​ ( 2 x + 1 − 4 x 2 − 4 x − 5 ​ ) = ...

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Diperhatikan limit bentuk tak tentu berikut. jika dan hanya jika jika dan hanya jika jika dan hanya jika dengan menggunakan rumus diperoleh Jadi, nilaidari adalah 2.

Diperhatikan limit bentuk tak tentu begin mathsize 14px style infinity minus infinity end style berikut.

begin mathsize 14px style limit as x rightwards arrow infinity of open parentheses square root of a x squared plus b x plus c end root minus square root of p x squared plus q x plus r end root close parentheses equals L end style 

  • begin mathsize 14px style L equals negative infinity end style jika dan hanya jika begin mathsize 14px style a less than p end style
  • L equals fraction numerator b minus q over denominator 2 square root of a end fraction jika dan hanya jika begin mathsize 14px style a equals p end style
  • begin mathsize 14px style L equals infinity end style jika dan hanya jika begin mathsize 14px style a greater than p end style

 

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack space lim with x rightwards arrow infinity below open parentheses 2 x plus 1 minus square root of 4 x squared minus 4 x minus 5 end root close parentheses end cell equals cell limit as x rightwards arrow infinity of open parentheses square root of open parentheses 2 x plus 1 close parentheses squared end root minus square root of 4 x squared minus 4 x minus 5 end root close parentheses end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space end cell equals cell limit as x rightwards arrow infinity of open parentheses square root of 4 x squared plus 4 x plus 1 end root minus square root of 4 x squared minus 4 x minus 5 end root close parentheses end cell row blank blank blank end table end style

dengan menggunakan rumus begin mathsize 14px style fraction numerator b minus q over denominator 2 square root of a end fraction end style diperoleh

begin mathsize 14px style fraction numerator 4 minus open parentheses negative 4 close parentheses over denominator 2 square root of 4 end fraction equals fraction numerator 8 over denominator 2 times 2 end fraction equals 8 over 4 equals 2 end style  

 

Jadi, nilai dari table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell stack space lim with x rightwards arrow infinity below end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open parentheses 2 x plus 1 minus square root of 4 x squared minus 4 x minus 5 end root close parentheses end cell end table adalah 2.

     

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