Materi: Matematika
Kelas: X SMA
Bab: Fungsi Kuadrat
Tingkat Kesulitan: Mudah
Pembahasan:
Koordinat titik puncak [tex](-\frac{b}{2a} , -\frac{D}{4a})[/tex]
Fungsi [tex]y = -x^2 + 3x + 4[/tex]
[tex]x_{puncak} = -\frac{b}{2a}\\x_{puncak} = -\frac{3}{2(-1)}\\x_{puncak} = \frac{3}{2}[/tex]
Substitusi nilai [tex]x_{puncak}[/tex] ke fungsi [tex]y[/tex]
[tex]y_{puncak} = -(\frac{3}{2})^2 + 3(\frac{3}{2}) + 4\\y_{puncak} = -\frac{9}{4} + \frac{9}{2} + 4\\y_{puncak} = -\frac{9}{4} + \frac{18}{4} + \frac{16}{4}\\y_{puncak} = \frac{25}{4}[/tex]
∵ Maka, koordinat titik puncak adalah [tex](\frac{3}{2} , \frac{25}{4})[/tex]
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Materi: Matematika
Kelas: X SMA
Bab: Fungsi Kuadrat
Tingkat Kesulitan: Mudah
Pembahasan:
Koordinat titik puncak [tex](-\frac{b}{2a} , -\frac{D}{4a})[/tex]
Fungsi [tex]y = -x^2 + 3x + 4[/tex]
[tex]x_{puncak} = -\frac{b}{2a}\\x_{puncak} = -\frac{3}{2(-1)}\\x_{puncak} = \frac{3}{2}[/tex]
Substitusi nilai [tex]x_{puncak}[/tex] ke fungsi [tex]y[/tex]
[tex]y_{puncak} = -(\frac{3}{2})^2 + 3(\frac{3}{2}) + 4\\y_{puncak} = -\frac{9}{4} + \frac{9}{2} + 4\\y_{puncak} = -\frac{9}{4} + \frac{18}{4} + \frac{16}{4}\\y_{puncak} = \frac{25}{4}[/tex]
∵ Maka, koordinat titik puncak adalah [tex](\frac{3}{2} , \frac{25}{4})[/tex]