Question

tìm x biết 3(x-1)^2-3x(x-5)=1

 

Answer 1

Ta có: \(3\left(x-1\right)^2-3x\left(x-5\right)=1\)

\(\Leftrightarrow3x^2-6x+3-3x^2+15x=1\)

\(\Leftrightarrow9x=-2\)

hay \(x=-\dfrac{2}{9}\)

Answer 2

3(x-1)²-3x(x-5)=1

<=>3(x²-2x+1)-3x²+15x=1

<=>3x²-6x+3-3x²+15x=1

<=>9x=-2

<=>x=-2/9