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Pertanyaan

Jika x 1 ​ dan x 2 ​ penyelesaian persamaan ( 9 4 ​ ) x 2 − 3 × ( 27 8 ​ ) 1 − x = 2 3 ​ , nilai ( x 1 ​ − x 2 ​ ) 2 adalah ....

Jika  dan  penyelesaian persamaan , nilai  adalah ....

  1. 9 over 4 

  2. 25 over 4 

  3. 49 over 4 

  4. 25 over 9 

  5. 25 

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R. Hajrianti

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah B.

jawaban yang benar adalah B.

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Pembahasan

Ingat kembali bentuk persamaan eksponen berikut: Maka: Sehingga: Jadi, jawaban yang benar adalah B.

Ingat kembali bentuk persamaan eksponen berikut:

straight a to the power of straight f open parentheses straight x close parentheses end exponent equals straight a to the power of straight m comma space straight a greater than 0 space rightwards arrow space straight f open parentheses straight x close parentheses equals straight m 

Maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses 4 over 9 close parentheses to the power of x squared minus 3 end exponent cross times open parentheses 8 over 27 close parentheses to the power of 1 minus x end exponent end cell equals cell 3 over 2 end cell row cell open parentheses 2 squared over 3 squared close parentheses to the power of x squared minus 3 end exponent cross times open parentheses 2 cubed over 3 cubed close parentheses to the power of 1 minus x end exponent end cell equals cell open parentheses 2 to the power of negative 1 end exponent over 3 to the power of negative 1 end exponent close parentheses end cell row cell open parentheses open parentheses 2 over 3 close parentheses squared close parentheses to the power of x squared minus 3 end exponent cross times open parentheses open parentheses 2 over 3 close parentheses cubed close parentheses to the power of 1 minus x end exponent end cell equals cell open parentheses 2 over 3 close parentheses to the power of negative 1 end exponent end cell row cell open parentheses 2 over 3 close parentheses to the power of 2 x squared minus 6 end exponent cross times open parentheses 2 over 3 close parentheses to the power of 3 minus 3 x end exponent end cell equals cell open parentheses 2 over 3 close parentheses to the power of negative 1 end exponent end cell row cell open parentheses 2 over 3 close parentheses to the power of open parentheses 2 x squared minus 6 close parentheses plus open parentheses 3 minus 3 x close parentheses end exponent end cell equals cell open parentheses 2 over 3 close parentheses to the power of negative 1 end exponent end cell row cell open parentheses 2 over 3 close parentheses to the power of 2 x squared minus 6 plus 3 minus 3 x end exponent end cell equals cell open parentheses 2 over 3 close parentheses to the power of negative 1 end exponent end cell row cell open parentheses 2 over 3 close parentheses to the power of 2 x squared minus 3 x minus 3 end exponent end cell equals cell open parentheses 2 over 3 close parentheses to the power of negative 1 end exponent end cell row cell 2 x squared minus 3 x minus 3 end cell equals cell negative 1 end cell row cell 2 x squared minus 3 x minus 3 plus 1 end cell equals 0 row cell 2 x squared minus 3 x minus 2 end cell equals 0 row cell open parentheses 2 x plus 1 close parentheses open parentheses x minus 2 close parentheses end cell equals 0 row x equals cell negative 1 half space atau space x equals 2 end cell end table 

Sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses x subscript 1 minus x subscript 2 close parentheses squared end cell equals cell open parentheses negative 1 half minus 2 close parentheses squared end cell row blank equals cell open parentheses negative 1 half minus 4 over 2 close parentheses squared end cell row blank equals cell open parentheses negative 5 over 2 close parentheses squared end cell row blank equals cell 25 over 4 end cell end table 

Jadi, jawaban yang benar adalah B.

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