Question

Tìm x : 

b) ( 3x + 2 )( x - 1 ) - 3( x + 1 )( x - 2 ) = 4

Answer 1

\(\left(3x+2\right)\left(x-1\right)-3\left(x+1\right)\left(x-2\right)=4\)

\(\Leftrightarrow3x^2-x-2-3x^2+3x+6=4\)

\(\Leftrightarrow2x+4=4\)

\(\Leftrightarrow2x=0\)

\(\Leftrightarrow x=0\)

Answer 2

\(\left(3x+2\right)\left(x-1\right)-3\left(x+1\right)\left(x-2\right)=4\)

\(\Leftrightarrow3x^2-x-2-3\left(x^2-x-2\right)-4=0\)

\(\Leftrightarrow2x=0\Leftrightarrow x=0\)