Carilah Titik Puncak dari a=2 b=20 c=-16

[tex]x = \frac{ - b}{2a} = \frac{ - 20}{2.2} = - 5[/tex]
[tex]y = \frac{ - ( {b}^{2} - 4ac)}{4a} \\ = \frac{ - ( {20}^{2} - 4.2. - 16) }{4.2} \\ = \frac{ - (400 + 128)}{8} \\ = \frac{ -528 }{8}[/tex]