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Diberikan suatu kesamaan polynomial sebagai berikut. ( x + 1 ) ( x − 3 ) 2 x 3 − 5 x 2 + 18 x − 10 ​ = 1 + ( x + 1 ) ( x − 3 ) 2 ( a x + b ) ​ Nilai dari a + b = ...

Diberikan suatu kesamaan polynomial sebagai berikut.

Nilai dari 

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O. Rahmawati

Master Teacher

Mahasiswa/Alumni UIN Sunan Gunung Djati Bandung

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Pembahasan

Mengoperasikan kesamaan polynomial: Dari kesamaan polynomial diatas, diperoleh: dan Maka, nilai

Mengoperasikan kesamaan polynomial:

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator x cubed minus 5 x squared plus 18 x minus 10 over denominator open parentheses x plus 1 close parentheses open parentheses x minus 3 close parentheses squared end fraction end cell equals cell 1 plus fraction numerator open parentheses straight a x plus straight b close parentheses over denominator open parentheses x plus 1 close parentheses open parentheses x minus 3 close parentheses squared end fraction end cell row cell fraction numerator x cubed minus 5 x squared plus 18 x minus 10 over denominator open parentheses x plus 1 close parentheses open parentheses x minus 3 close parentheses squared end fraction end cell equals cell fraction numerator open parentheses x plus 1 close parentheses open parentheses x minus 3 close parentheses squared plus open parentheses straight a x plus straight b close parentheses over denominator open parentheses x plus 1 close parentheses open parentheses x minus 3 close parentheses squared end fraction end cell row cell x cubed minus 5 x squared plus 18 x minus 10 end cell equals cell open parentheses x plus 1 close parentheses open parentheses x minus 3 close parentheses squared plus open parentheses straight a x plus straight b close parentheses end cell row cell x cubed minus 5 x squared plus 18 x minus 10 end cell equals cell open parentheses x plus 1 close parentheses open parentheses x squared minus 6 x plus 9 close parentheses plus open parentheses straight a x plus straight b close parentheses end cell row cell x cubed minus 5 x squared plus 18 x minus 10 end cell equals cell open parentheses x cubed minus 6 x squared plus 9 x plus x squared minus 6 x plus 9 close parentheses plus open parentheses straight a x plus straight b close parentheses end cell row cell x cubed minus 5 x squared plus 18 x minus 10 end cell equals cell x cubed minus 5 x squared plus left parenthesis 3 plus straight a right parenthesis x plus 9 plus straight b end cell end table end style

Dari kesamaan polynomial diatas, diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell 3 plus straight a end cell equals 18 row straight a equals cell 18 minus 3 end cell row straight a equals 15 end table  dan table attributes columnalign right center left columnspacing 0px end attributes row cell 9 plus straight b end cell equals cell negative 10 end cell row straight b equals cell negative 10 minus 9 end cell row straight b equals cell negative 19 end cell end table

Maka, nilai straight a plus straight b equals 15 minus 19 equals negative 4

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