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Pertanyaan

Nilai dari x → ∞ lim ​ 4 x 2 − 2 x + 3 ​ − 4 x 2 + 5 x − 7 ​ adalah ...

Nilai dari  adalah ... 

  1. 2 

  2. 5 over 3 

  3. negative 7 over 4 

  4. 0 

  5. infinity 

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N. Puspita

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

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Pembahasan

Pembahasan
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Ingat! Diketahui , maka: , makanilai limit tersebutadalah: Sehingga, . Jadi, jawaban yang tepat adalah C.

Ingat!

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 open curly brackets table attributes columnalign left end attributes row cell infinity comma space untuk space a greater than p end cell row cell table row cell fraction numerator b minus q over denominator 2 square root of a end fraction comma space untuk space a equals p end cell row cell negative infinity comma space untuk space a less than p end cell end table end cell end table close 

Diketahui limit as x rightwards arrow infinity of square root of 4 x squared minus 2 x plus 3 end root minus square root of 4 x squared plus 5 x minus 7 end root, maka:

table attributes columnalign right center left columnspacing 0px end attributes row a equals cell 4 comma space b equals negative 2 comma space c equals 3 end cell row p equals cell 4 comma space q equals 5 comma space r equals negative 7 end cell end table 

a equals p, maka nilai limit tersebut adalah:

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell limit as x rightwards arrow infinity of square root of 4 x squared minus 2 x plus 3 end root minus square root of 4 x squared plus 5 x minus 7 end root end cell row blank equals cell fraction numerator b minus q over denominator 2 square root of a end fraction end cell row blank equals cell fraction numerator negative 2 minus 5 over denominator 2 square root of 4 end fraction end cell row blank equals cell negative 7 over 4 end cell end table   

Sehingga, table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell limit as x rightwards arrow infinity of end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 4 x squared minus 2 x plus 3 end root end cell 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 4 x squared plus 5 x minus 7 end root end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank 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 7 over 4 end cell end table.

Jadi, jawaban yang tepat adalah C.

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