gambar terlampir
Penjelasan dengan langkah-langkah:
y = -x² + 2x + 1
a = -1, b = 2, c = 1
• Titik potong sumbu y, (0, c)
titik potongnya (0, 1)
• titik potong sumbu x, y = 0
-x² + 2x + 1 = 0
x² - 2x - 1 = 0
x² - 2x = 1
x² - 2x + 1 = 1 + 1
(x + 1)² = 2
x + 1 = ±√2
x1 = √2 - 1 x2 = -√2 - 1
titik potongnya (√2 - 1 , 0) dan
(-√2 - 1 , 0)
• sumbu simetri
xp = -b/2a = -2/2.(-1) = -2/-2 = 1
• titik ekstrim (maksimum)
yp = -1² + 2.1 + 1
= -1 + 2 - 1
= 2
• titik puncak (xp, yp) = (1, 2)
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gambar terlampir
Penjelasan dengan langkah-langkah:
y = -x² + 2x + 1
a = -1, b = 2, c = 1
• Titik potong sumbu y, (0, c)
titik potongnya (0, 1)
• titik potong sumbu x, y = 0
-x² + 2x + 1 = 0
x² - 2x - 1 = 0
x² - 2x = 1
x² - 2x + 1 = 1 + 1
(x + 1)² = 2
x + 1 = ±√2
x1 = √2 - 1 x2 = -√2 - 1
titik potongnya (√2 - 1 , 0) dan
(-√2 - 1 , 0)
• sumbu simetri
xp = -b/2a = -2/2.(-1) = -2/-2 = 1
• titik ekstrim (maksimum)
yp = -1² + 2.1 + 1
= -1 + 2 - 1
= 2
• titik puncak (xp, yp) = (1, 2)