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Diketahui suku banyak f ( x ) = 2 x 5 + 3 x 4 − a x 3 − 5 x 2 + 7 x + 20 agar f ( − 2 ) = − 6 , maka nilai a = ...

Diketahui suku banyak  agar , maka nilai  

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Y. Herlanda

Master Teacher

Mahasiswa/Alumni STKIP PGRI Jombang

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nilai .

nilai a equals 3.

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Pembahasan

Jadi, nilai .

table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x close parentheses end cell equals cell 2 x to the power of 5 plus 3 x to the power of 4 minus a x cubed minus 5 x squared plus 7 x plus 20 end cell row cell f open parentheses negative 2 close parentheses end cell equals cell negative 6 end cell row cell negative 6 end cell equals cell 2 x to the power of 5 plus 3 x to the power of 4 minus a x cubed minus 5 x squared plus 7 x plus 20 end cell row cell negative 6 end cell equals cell 2 open parentheses negative 2 close parentheses to the power of 5 plus 3 open parentheses negative 2 close parentheses to the power of 4 minus a open parentheses negative 2 close parentheses cubed minus 5 open parentheses negative 2 close parentheses squared plus 7 open parentheses negative 2 close parentheses plus 20 end cell row cell negative 6 end cell equals cell 2 open parentheses negative 32 close parentheses plus 3 open parentheses 16 close parentheses minus a open parentheses negative 8 close parentheses minus 5 open parentheses 4 close parentheses minus 14 plus 20 end cell row cell negative 6 end cell equals cell negative 64 plus 48 plus 8 a minus 20 minus 14 plus 20 end cell row 24 equals cell 8 a end cell row a equals 3 end table   

Jadi, nilai a equals 3.

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