Question

tìm x: (x-1)(2x+5)=2x-2

Answer 1

`<=> 2x^2 + 3x - 5 = 2x - 2`

`<=> 2x^2 + x - 3 = 0`

`<=> 2x^2 - 2x + 3x - 3 = 0`

`<=> 2x(x-1) + 3(x-1) = 0`

`<=> (2x+3)(x-1) = 0`

`=> x = -3/2` hoặc `x = 1`

Answer 2

\(\left(x-1\right)\left(2x+5\right)=2x-2\)

\(\Rightarrow2x^2+5x-2x-5-2x+2=0\)

\(\Rightarrow2x^2+6x-x-3=0\)

\(\Rightarrow\left(2x^2+6x\right)-\left(x+3\right)=0\)

\(\Rightarrow\left(x+3\right)\left(2x-1\right)=0\)

.....

 

Answer 3