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Himpunan semua nilai c agar grafik = = 2 2 x 2 + 3 x − c dan y = 4 2 1 ​ x 2 + 2 1 ​ x + 1 berpotongan adalah ....

Himpunan semua nilai c agar grafik = berpotongan adalah ....

  1. begin mathsize 14px style open curly brackets straight c straight colon straight c less than negative 3 straight atau straight straight c greater than 3 close curly brackets end style 

  2. begin mathsize 14px style open curly brackets straight c straight colon straight c less than 0 straight atau straight straight c greater than 4 close curly brackets end style 

  3. begin mathsize 14px style open curly brackets straight c straight colon straight c greater than negative 3 close curly brackets end style 

  4. begin mathsize 14px style open curly brackets straight c straight colon negative 4 less than straight c less than 4 close curly brackets end style 

  5. begin mathsize 14px style open curly brackets straight c straight colon negative straight infinity less than straight c less than straight infinity close curly brackets end style 

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

Pembahasan

Perhatikan bahwa Diinginkan grafik berpotongan, maka Ingat bahwa jika , maka f(x) = g(x) sehingga dari persamaan di atas, kita peroleh Agar dua grafik yang dimaksud berpotongan, maka haruslah diskriminan dari persamaan kuadrat di atas positif, sehingga kita peroleh Jadi, jawaban yang tepat adalah C.

Perhatikan bahwa 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 4 to the power of 1 half straight x squared plus 1 half straight x plus 1 end exponent end cell equals cell open parentheses 2 squared close parentheses to the power of 1 half straight x squared plus 1 half straight x plus 1 end exponent semicolon open parentheses straight a to the power of straight p close parentheses to the power of straight q equals straight a to the power of pq end cell row blank equals cell 2 to the power of straight x squared plus straight x plus 2 end exponent end cell end table end style 

Diinginkan grafik begin mathsize 14px style straight y equals 2 to the power of 2 straight x squared plus 3 straight x minus straight c end exponent straight dan straight straight y equals 4 to the power of 1 half straight x squared plus 1 half straight x plus 1 end exponent end style berpotongan, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 to the power of 2 straight x squared plus 3 straight x minus straight c end exponent end cell equals cell 4 to the power of 1 half straight x squared plus 1 half straight x plus 1 end exponent end cell row cell 2 to the power of 2 straight x squared plus 3 straight x minus straight c end exponent end cell equals cell 2 to the power of straight x squared plus straight x plus 2 end exponent end cell end table end style 

Ingat bahwa jika begin mathsize 14px style straight a to the power of straight f open parentheses straight x close parentheses end exponent equals straight a to the power of straight g open parentheses straight x close parentheses end exponent end style , maka f(x) = g(x) sehingga dari persamaan di atas, kita peroleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 straight x squared plus 3 straight x minus straight c end cell equals cell straight x squared plus straight x plus 2 end cell row cell 2 straight x squared minus straight x squared plus 3 straight x minus straight x minus straight c minus 2 end cell equals 0 row cell straight x squared plus 2 straight x minus straight c minus 2 end cell equals 0 end table end style 

Agar dua grafik yang dimaksud berpotongan, maka haruslah diskriminan dari persamaan kuadrat di atas positif, sehingga kita peroleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight D greater than 0 row cell 2 squared minus 4 open parentheses 1 close parentheses open parentheses negative straight c minus 2 close parentheses end cell greater than 0 row cell 4 plus 4 straight c plus 8 end cell greater than 0 row cell 4 straight c end cell greater than cell negative 12 end cell row straight c greater than cell negative 3 end cell end table end style 

Jadi, jawaban yang tepat adalah C.

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