Question

Tìm x
3x² - (3x - 3) (-2 + x) = 39

Answer 1

3x² - (3x - 3) (-2 + x) = 39

<=>3x^2-(-6x+3x^2+6-3x)=39

<=> 9x-6=39

<=>9x=45

<=>x=5

Answer 2

`3x^2 - (3x-3)(-2+x) = 39`

`<=>3x^2-(-6x+3x^2+6-3x)=39`

`<=> 3x^2 +6x -3x^2 -6 +3x = 39`

`<=>9x-6 =39`

`<=> 9x=45`

`=> x = 45/9=5`

Vậy `S={5}`

Answer 3

3x² - (3x - 3) (-2 + x) = 39

=> 9x - 6 = 39

=> 9x = 45

vậy x = [ 5 ]

Answer 4

3x² - (3x - 3) (-2 + x) = 39

<=>3x^2-(-6x+3x^2+6-3x)=39

<=> 9x-6=39

<=>9x=45

<=>x=5