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Tentukan hasil operasiakar bilangan berikut! d. 3 2 ​ + 2 4 3 1 ​ + 9 3 ​ − 9 2 4 1 ​

Tentukan hasil operasi akar bilangan berikut!

d.     

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

Jawaban

hasil dari adalah .

hasil dari cube root of 2 plus 2 to the power of 4 1 third end exponent plus 9 square root of 3 minus 9 to the power of 2 1 fourth end exponent adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank 17 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell cube root of 2 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 72 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fourth root of 9 end cell end table.

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Pembahasan

Ingat kembali sifat akar berikut! Dengan rumus di atas, diperoleh perhitungan sebagai berikut. diubah ke bentuk akar menjadi diubah ke bentuk akar menjadi Selanjutnya diperoleh, Jadi, hasil dari adalah .

Ingat kembali sifat akar berikut!

  • a cube root of c plus b cube root of c equals left parenthesis a plus b right parenthesis cube root of c     
  • a to the power of m over n end exponent equals n-th root of a to the power of m end root 
  • a to the power of m cross times a to the power of n equals a to the power of m plus n end exponent 

Dengan rumus di atas, diperoleh perhitungan sebagai berikut.

2 to the power of 4 1 third end exponent diubah ke bentuk akar menjadi

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 to the power of 4 1 third end exponent end cell equals cell 2 to the power of 4 plus 1 third end exponent end cell row blank equals cell 2 to the power of 4 cross times 2 to the power of 1 third end exponent end cell row blank equals cell 16 cross times cube root of 2 end cell row blank equals cell 16 cube root of 2 end cell end table 

9 to the power of 2 1 fourth end exponent diubah ke bentuk akar menjadi

table attributes columnalign right center left columnspacing 0px end attributes row cell 9 to the power of 2 1 fourth end exponent end cell equals cell 9 to the power of 2 plus 1 fourth end exponent end cell row blank equals cell 9 squared cross times 9 to the power of 1 fourth end exponent end cell row blank equals cell 81 cross times fourth root of 9 end cell row blank equals cell 81 fourth root of 9 end cell end table 

  • table attributes columnalign right center left columnspacing 0px end attributes row cell 9 square root of 3 end cell equals cell 9 fourth root of 3 squared end root end cell row blank equals cell 9 fourth root of 9 end cell end table 

Selanjutnya diperoleh, 

table attributes columnalign right center left columnspacing 0px end attributes row cell cube root of 2 plus 2 to the power of 4 1 third end exponent plus 9 square root of 3 minus 9 to the power of 2 1 fourth end exponent end cell equals cell cube root of 2 plus 16 cube root of 2 plus 9 fourth root of 9 minus 81 fourth root of 9 end cell row blank equals cell left parenthesis cube root of 2 plus 16 cube root of 2 right parenthesis plus left parenthesis 9 fourth root of 9 minus 81 fourth root of 9 right parenthesis end cell row blank equals cell left parenthesis 1 plus 16 right parenthesis cube root of 2 plus left parenthesis 9 minus 81 right parenthesis fourth root of 9 end cell row blank equals cell 17 cube root of 2 minus 72 fourth root of 9 end cell end table          

Jadi, hasil dari cube root of 2 plus 2 to the power of 4 1 third end exponent plus 9 square root of 3 minus 9 to the power of 2 1 fourth end exponent adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank 17 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell cube root of 2 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 72 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fourth root of 9 end cell end table.

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