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Dari bentuk x 2 − x − 2 5 x − 1 ​ = x + 1 A ​ + x − 2 B ​ . Nilai A − B = ...

Dari bentuk . Nilai  ...

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S. Ayu

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Prof. DR. Hamka

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Pembahasan

Diperoleh hasil persamaannya yaitu: Kemudian dengan metode eliminasi diperoleh: Substitusi nilai A ke persamaan . Sehingga diperoleh: Maka, nilai .

Diperoleh hasil persamaannya yaitu:

table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator 5 x minus 1 over denominator x squared minus x minus 2 end fraction end cell equals cell fraction numerator A over denominator x plus 1 end fraction plus fraction numerator B over denominator x minus 2 end fraction end cell row cell fraction numerator 5 x minus 1 over denominator x squared minus x minus 2 end fraction end cell equals cell fraction numerator A open parentheses x minus 2 close parentheses over denominator open parentheses x plus 1 close parentheses open parentheses x minus 2 close parentheses end fraction plus fraction numerator B open parentheses x plus 1 close parentheses over denominator open parentheses x minus 2 close parentheses open parentheses x plus 1 close parentheses end fraction end cell row cell fraction numerator 5 x minus 1 over denominator x squared minus x minus 2 end fraction end cell equals cell fraction numerator A x minus 2 A plus B x plus B over denominator open parentheses x plus 1 close parentheses open parentheses x minus 2 close parentheses end fraction end cell row cell fraction numerator 5 x minus 1 over denominator x squared minus x minus 2 end fraction end cell equals cell fraction numerator A x minus 2 A plus B x plus B over denominator x squared minus 2 x plus x minus 2 end fraction end cell row cell fraction numerator 5 x minus 1 over denominator x squared minus x minus 2 end fraction end cell equals cell fraction numerator A x minus 2 A plus B x plus B over denominator x squared minus x minus 2 end fraction end cell row cell open parentheses 5 x minus 1 close parentheses down diagonal strike open parentheses x squared minus x minus 2 close parentheses end strike end cell equals cell open parentheses A x minus 2 A plus B x plus B close parentheses down diagonal strike open parentheses x squared minus x minus 2 close parentheses end strike end cell row cell A x minus 2 A plus B x plus B end cell equals cell 5 x minus 1 end cell row cell open parentheses A plus B close parentheses x plus open parentheses negative 2 A plus B close parentheses end cell equals cell open parentheses 5 close parentheses x plus open parentheses negative 1 close parentheses end cell row cell A plus B end cell equals cell 5 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... open parentheses 1 close parentheses end cell row cell negative 2 A plus B end cell equals cell negative 1 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... open parentheses 2 close parentheses end cell end table

Kemudian dengan metode eliminasi diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell table attributes columnalign right center left end attributes row cell A plus B end cell equals 5 row cell negative 2 A plus B end cell equals cell negative 1 space space minus end cell row cell 3 A end cell equals 6 row A equals cell 6 over 3 end cell row A equals 2 end table end cell end table

Substitusi nilai A ke persamaan open parentheses 1 close parentheses.

table attributes columnalign right center left columnspacing 0px end attributes row cell A plus B end cell equals 5 row cell 2 plus B end cell equals 5 row B equals cell 5 minus 2 end cell row B equals 3 end table

Sehingga diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell A minus B end cell equals cell 2 minus 3 end cell row blank equals cell negative 1 end cell end table

Maka, nilai A minus B equals negative 1.

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