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Akar-akar polinomial x 4 − 8 x 3 + p x 2 + q x + r = 0 membentuk deret aritmetika dengan beda − 2 . Tentukan nilai p , q , dan r .

Akar-akar polinomial  membentuk deret aritmetika dengan beda . Tentukan nilai , dan .

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 begin mathsize 14px style p equals 14 comma space q equals 8 comma space dan space r equals space minus 15 end style 

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Pembahasan

Polinomial memilikiakarmembentuk deret aritmatika dengan beda = 2 Ingat : Maka Diperoleh Sehingga Jadi

Polinomial begin mathsize 14px style x to the power of 4 minus 8 x cubed plus p x squared plus q x plus r equals 0 end style 
begin mathsize 14px style straight a equals 1 comma space straight b equals negative 8 comma space straight c equals straight p comma space straight d equals straight q comma space straight e equals straight r end style 

memiliki akar membentuk deret aritmatika dengan beda = 2

begin mathsize 14px style bullet x subscript 1 bullet x subscript 2 equals x subscript 1 plus 2 bullet x subscript 3 equals x subscript 1 plus 4 bullet x subscript 4 equals x subscript 1 plus 6 end style 

Ingat : begin mathsize 14px style x subscript 1 plus x subscript 2 plus x subscript 3 plus x subscript 4 equals fraction numerator negative b over denominator a end fraction end style 
Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell x subscript 1 plus x subscript 2 plus x subscript 3 plus x subscript 4 end cell equals cell fraction numerator negative open parentheses negative 8 close parentheses over denominator 1 end fraction end cell row cell x subscript 1 plus x subscript 1 plus 2 plus x subscript 1 plus 4 plus x subscript 1 plus 6 end cell equals 8 row cell 4 x subscript 1 end cell equals cell 8 minus 12 end cell row cell x subscript 1 end cell equals cell fraction numerator negative 4 over denominator 4 end fraction end cell row cell x subscript 1 end cell equals cell negative 1 end cell end table end style 

Diperoleh

 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell bullet x subscript 1 end cell equals cell negative 1 end cell row cell bullet x subscript 2 end cell equals 1 row cell bullet x subscript 3 end cell equals 3 row cell bullet x subscript 4 end cell equals 5 end table end style 

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses x plus 1 close parentheses open parentheses x minus 1 close parentheses open parentheses x minus 3 close parentheses open parentheses x minus 5 close parentheses end cell equals cell x to the power of 4 minus 8 x cubed plus p x squared plus q x plus r end cell row cell open parentheses x squared minus 1 close parentheses open parentheses x squared minus 8 x plus 15 close parentheses end cell equals cell x to the power of 4 minus 8 x cubed plus p x squared plus q x plus r end cell row cell x to the power of 4 minus 8 x cubed plus 14 x squared plus 8 x minus 15 end cell equals cell x to the power of 4 minus 8 x cubed plus p x squared plus q x plus r end cell end table end style

Jadi begin mathsize 14px style p equals 14 comma space q equals 8 comma space dan space r equals space minus 15 end style 

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