Question

| x( x + 3 )| = x

Answer 1

|x(x + 3)| = x

=> |x|.|x + 3| = x

=> \(x\ge0\)

=> x.(x + 3) = x

Mà \(x\ge0\)=> x = 0

Answer 2

Ta có:

x(x+3)=x

x^2+3x-x=0

x^2+2x=0

x^2=2x

=>x=-2 hoặc 0