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Nilai dari: x → ∞ L im ​ 5 x − 3 − 25 x 2 − 10 x + 6 ​ = ...

Nilai dari:

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N. Puspita

Master Teacher

Jawaban terverifikasi

Jawaban

nilai adalah -2.

nilai table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell stack l i m with x rightwards arrow infinity below end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank x end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 3 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 25 x squared minus 10 x plus 6 end root end cell end tableadalah -2.

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Pembahasan

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Diperhatikan limit bentuk tak tentu berikut. jika dan hanya jika jika dan hanya jika jika dan hanya jika sehingga x → ∞ L im ​ 5 x − 3 − 25 x 2 − 10 x + 6 ​ ​ = = = = = = ​ x → ∞ L im ​ ( 5 x − 3 ) 2 ​ − 25 x 2 − 10 x + 6 ​ x → ∞ L im ​ 25 x 2 − 30 x + 9 ​ − 25 x 2 − 10 x + 6 ​ 2 a ​ b − q ​ 2 25 ​ − 30 + 10 ​ 10 − 20 ​ − 2 ​ Jadi, nilai 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

sehingga

Jadi, nilai table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell stack l i m with x rightwards arrow infinity below end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank x end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 3 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 25 x squared minus 10 x plus 6 end root end cell end tableadalah -2.

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