Question

Answer 1

`x.(3x-16)=-5`

`3x^2 -16x = -5`

`3x^2-16x+5=0`

`(3x-1).(x-5)=0`

`=>3x-1=0` hoặc `x-5=0`

`3x=1` hoặc `x=5`

`=> x=1/3` hoặc `x=5`

Answer 2

`x(3x-16)=-5`

`=>3x^2 -16x +5=0`

`=>3x^2 -15x -x +5=0`

`=>3x(x-5)-(x-5)=0`

`=>(3x-1)(x-5)=0`

\(\left[{}\begin{matrix}x-5=0\Rightarrow x=5\\3x-1=0\Rightarrow x=\dfrac{1}{3}\end{matrix}\right.\)

vậy `x∈{5;1/3}`