fungsi kuadrat
• titik puncak P(xp,yp)
P(-1,3)
y = a(x - xp)² + yp
y = a(x - (-1))² + 3
y = a(x + 1)² + 3
• melalui titik A(1,-1)
-1 = a(1 + 1)² + 3
-1 = 4a + 3
4a = -4
a = -1
Rumus fungsi kuadrat dari gambar :
y = -1(x + 1)² + 3
y = -(x² + 2x + 1) + 3
y = -x² - 2x - 1 + 3
y = -x² - 2x + 2
f(x) = -x² - 2x + 2
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fungsi kuadrat
• titik puncak P(xp,yp)
P(-1,3)
y = a(x - xp)² + yp
y = a(x - (-1))² + 3
y = a(x + 1)² + 3
• melalui titik A(1,-1)
y = a(x + 1)² + 3
-1 = a(1 + 1)² + 3
-1 = 4a + 3
4a = -4
a = -1
Rumus fungsi kuadrat dari gambar :
y = -1(x + 1)² + 3
y = -(x² + 2x + 1) + 3
y = -x² - 2x - 1 + 3
y = -x² - 2x + 2
f(x) = -x² - 2x + 2