nilai minimum fungsi kuadra [tex] nilai \: minimum \: fungsi \: kuadrat \: dari \: f(x) = 4x { - 9}^{2} \: \: \: pakai \: cara[/tex]

[tex]y=4x^2-9\\ nilai\ minimum?\\ \frac {-b}{2a}\\ \frac {-(-9)}{2.4}\\ =\frac {9}{8}(untuk\ nilai\ minimum\ x)\\ jika\ nilai\ minimum\ y\\y=4.9^2/8^2-9\\ y=4.\frac {81}{64} -9\\ y=\frac {324}{64}-9\\ y=\frac {-252}{64} \\y=\frac {-63}{16}\\ kordinat\ (\frac {9}{8},\frac {-63}{16})[/tex]