Mohon bantuannya kak,no 2 dan 3

2) n – 4/n = 0 ( dikali n )
n² – 4 = 0
n² = 4
n = √4
n = ±2
→ n = { -2 , 2 }
jawaban : a

3) x(2x + 1) – x(x -3) = 0
2x² + x – x² + 3x = 0
x² + 4x = 0
x( x + 4) = 0
x1 = 0
x + 4 = 0
x2 = -4
hp = { -4 , 0 }
jawaban : a