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Diberikan  dan  . Nilai (f+g)(−2) adalah ...

Pertanyaan

Diberikan size 14px f size 14px left parenthesis size 14px x size 14px right parenthesis size 14px equals size 14px x to the power of size 14px 2 size 14px plus size 14px 8 size 14px x size 14px minus size 14px 14 dan size 14px g size 14px left parenthesis size 14px x size 14px right parenthesis size 14px equals size 14px 9 size 14px x to the power of size 14px 2 size 14px minus size 14px 2 size 14px x size 14px plus size 14px 16 . Nilai size 14px left parenthesis size 14px f size 14px plus size 14px g size 14px right parenthesis size 14px left parenthesis size 14px minus size 14px 2 size 14px right parenthesis adalah ...

  1.  size 14px 22

  2.  size 14px 26

  3. size 14px 28

  4. begin mathsize 14px style 30 end style

  5. size 14px 32

M. Robo

Master Teacher

Jawaban terverifikasi

Jawaban

jawabannya adalah D.

Pembahasan

Ingat kembali bahwa begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis x right parenthesis equals f left parenthesis x right parenthesis plus g left parenthesis x right parenthesis end style. JIka begin mathsize 14px style x equals negative 2 end style, maka

 begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis negative 2 right parenthesis equals f left parenthesis negative 2 right parenthesis plus g left parenthesis negative 2 right parenthesis end style.

Perhatikan perhitungan berikut ini!

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f plus g right parenthesis left parenthesis negative 2 right parenthesis end cell equals cell f left parenthesis negative 2 right parenthesis plus g left parenthesis negative 2 right parenthesis end cell row blank equals cell left parenthesis negative 2 right parenthesis squared plus 8 times left parenthesis negative 2 right parenthesis minus 14 plus 9 times left parenthesis negative 2 right parenthesis squared minus 2 times left parenthesis negative 2 right parenthesis plus 16 end cell row blank equals cell 4 minus 16 minus 14 plus 36 plus 4 plus 16 end cell row blank equals 30 end table end style

Jadi, jawabannya adalah D.

125

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