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Pertanyaan

Diketahui kesamaan ( x + 3 ) ( 2 x − 5 ) − x + 8 ​ = x + 3 A ​ + 2 x − 5 B ​ . Nilai A + B adalah ....

Diketahui kesamaan . Nilai  adalah ....

  1. begin mathsize 14px style negative 2 end style 

  2. begin mathsize 14px style negative 1 end style 

  3. begin mathsize 14px style 0 end style

     

  4. begin mathsize 14px style 1 end style 

  5. begin mathsize 14px style 2 end style 

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F. Khansabyla

Master Teacher

Mahasiswa/Alumni Universitas Gadjah Mada

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah B.

jawaban yang tepat adalah B.

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Pembahasan

Eliminasi keduanya Jadi, jawaban yang tepat adalah B.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator negative x plus 8 over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell equals cell fraction numerator A over denominator x plus 3 end fraction plus fraction numerator B over denominator 2 x minus 5 end fraction end cell row cell fraction numerator negative x plus 8 over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell equals cell fraction numerator A left parenthesis 2 x minus 5 right parenthesis plus B left parenthesis x plus 3 right parenthesis over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell row cell fraction numerator negative x plus 8 over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell equals cell fraction numerator 2 A x minus 5 A plus B x plus 3 B over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell row cell fraction numerator negative x plus 8 over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell equals cell fraction numerator left parenthesis 2 A plus B right parenthesis x plus left parenthesis negative 5 A plus 3 B right parenthesis over denominator left parenthesis x plus 3 right parenthesis left parenthesis 2 x minus 5 right parenthesis end fraction end cell end table end style  

begin mathsize 14px style 2 A plus B equals negative 1 end style  

begin mathsize 14px style negative 5 A plus 3 B equals 8 end style  

Eliminasi keduanya

begin mathsize 14px style space space space space 2 A plus B equals negative 1 space space space cross times 3 bottom enclose negative 5 A plus 3 B equals 8 space space space minus cross times 1 end enclose space space space 6 A plus 3 B equals negative 3 bottom enclose negative 5 A plus 3 B equals 8 space space space space minus end enclose space space space space space space space space 11 A equals negative 11 space space space space space space space space space space space space space space space A equals negative 1 end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 A plus B end cell equals cell negative 1 end cell row cell 2 A minus 1 end cell equals cell negative 1 end cell row cell 2 A end cell equals 0 row A equals 0 end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell A plus B end cell equals cell negative 1 plus 0 end cell row blank equals cell negative 1 end cell end table end style 

Jadi, jawaban yang tepat adalah B.

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Diberikan polinomial f ( x ) = − 8 x 3 + x 2 + 3 dan g ( x ) = a x 2 + b x 3 + 3. Jika diketahui f ( x ) = g ( x ) , maka ....

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