fungsi kuadrat y=(x+2)²-4

[tex]y = ( {x + 2)}^{2} - 4 \\ y = (x + 2)(x + 2) - 4 \\ y = {x}^{2} + 4x + 4 - 4 \\ y = {x}^{2} + 4x \\ y = x(x + 4)[/tex]