tentukan titik puncak dari fungsi kuadrat (×)=ײ+2x-4

f(x) = x² + 2x - 4
a = 1
b = 2
c = -4

[tex]x = - \frac{b}{2a} = - \frac{2}{2(1)} = - 1 \\ y = - \frac{d}{4a} = - \frac{ {b}^{2} - 4ac }{4a} \\ y = \frac{ {2}^{2} - 4(1)( - 4) }{ - 4(1)} \\ y = \frac{4 + 16}{ - 4} = \frac{20}{ - 4} = - 5[/tex]
maka titik puncak fungsi kuadrat = (-1, -5)