Lupa nih bantuin dong x(2x+1) + 3 (2x+1) =

X(2x+1) + 3(2x+1)
> 2x²+x+6x+3
> 2x²+7x+3
> (2x+1)(x+3)
> x1 : 2x+1 = 0
        : 2x = -1
        : x = -1/2
> x2 : x+3 = 0
        : x = -3

Hp {-1/2,-3}

semoga membantu dan bermanfaat

X(2x+1) + 3(2x+1)=0
= 2x² + x + 6x + 3 = 0
= 2x² + 7x + 3 = 0
x= -1/2 atau x= -3