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yp=4
x=0
y=3
y= a (x-xp)² + yp
3=a(0-1)² + 4
3-4= a
a=-1
y= a (x-xp)² + yp
y=-1(x-1)² + 4
y= -1(x²-2x+1) + 4
y= -x²+2x-1+4
y= -x²+2x-3
3 = a (0 - 1)² + 4
3 = a .1 + 4
3 = a + 4
a = - 1
fungsi kuadrat : y = - 1(x - 1)² + 4
y = - 1(x² - 2x + 1) + 4
y = - x² + 2x - 1 + 4
y = - x² + 2x + 3