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Kurva y = 3 x + 1 − ( 9 1 ​ ) x berada di bawah kurva y = 3 x + 1 saat ....

Kurva  berada di bawah kurva  saat ....

  1. x < 2

  2. x > 1

  3. x < 1

  4. x > 0

  5. x < 0

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M. Robo

Master Teacher

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Misalkan 3 x = a maka persamaan diatas dirubah menjadi : Perhatikan bahwa (a - 1) &lt; 0 karena 2 a + a + 1 = 0 → definit positif

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 3 to the power of straight x plus 1 end exponent right parenthesis minus open parentheses 1 over 9 close parentheses to the power of straight x end cell less than cell 3 to the power of straight x plus 1 end cell row cell 3.3 to the power of straight x minus 3 to the power of negative 2 straight x end exponent end cell less than cell 3 to the power of straight x plus 1 end cell row cell 2.3 to the power of straight x minus 3 to the power of negative 2 straight x end exponent minus 1 end cell less than 0 end table end style 

Misalkan 3x a maka persamaan diatas dirubah menjadi :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 straight a minus 1 over straight a squared minus 1 end cell less than 0 row cell 2 straight a cubed minus straight a squared minus 1 end cell less than 0 row cell left parenthesis straight a minus 1 right parenthesis left parenthesis 2 straight a squared plus straight a plus 1 right parenthesis end cell less than 0 end table end style 

Perhatikan bahwa (a - 1) < 0 karena 2a + a + 1 = 0 → definit positif

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight a less than 1 row cell 3 to the power of straight x end cell less than 1 row cell 3 to the power of straight x end cell less than cell 3 to the power of 0 end cell row straight x less than 0 end table end style 

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