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Pertanyaan

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Fungsi begin mathsize 14px style f space colon space R rightwards arrow R end style dan begin mathsize 14px style g space colon space R rightwards arrow R end style, dirumuskan dengan begin mathsize 14px style f left parenthesis x right parenthesis equals 2 x minus 1 end style dan begin mathsize 14px style g left parenthesis x right parenthesis equals 5 x minus x squared end style. Tentukan nilai begin mathsize 14px style left parenthesis f ring operator g right parenthesis left parenthesis negative 1 right parenthesis end style !

  1. ...space 

  2. ...undefined 

Pembahasan Soal:

Diketahui begin mathsize 14px style f left parenthesis x right parenthesis equals 2 x minus 1 end style dan begin mathsize 14px style g left parenthesis x right parenthesis equals 5 x minus x squared end style. Ingat bahwa begin mathsize 14px style left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis equals f left parenthesis g left parenthesis x right parenthesis right parenthesis end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis end cell equals cell f left parenthesis g left parenthesis x right parenthesis right parenthesis end cell row blank equals cell 2 left parenthesis g left parenthesis x right parenthesis right parenthesis minus 1 end cell row blank equals cell 2 left parenthesis 5 x minus x squared right parenthesis minus 1 end cell row blank equals cell 10 x minus 2 x squared minus 1 end cell row blank equals cell negative 2 x squared plus 10 x minus 1 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f ring operator g right parenthesis left parenthesis negative 1 right parenthesis end cell equals cell negative 2 left parenthesis negative 1 right parenthesis squared plus 10 left parenthesis negative 1 right parenthesis minus 1 end cell row blank equals cell negative 2 cross times 1 plus 10 cross times left parenthesis negative 1 right parenthesis minus 1 end cell row blank equals cell negative 2 minus 10 minus 1 end cell row blank equals cell negative 13 end cell row blank blank blank end table end style

Jadi, nilai dari undefined adalah begin mathsize 14px style negative 13 end style.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 12 Maret 2021

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