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Diketahui;(xp,yp) ----> (3,-2)
(x,y) --------> (-2,1)
fungsi kuadrat yg melalu puncak(xp,yp) dan titik (x,y) sembarang adalah
y= a(x-xp)²+yp
1=a(-2-3)²+ (-2)
1= 25a-2
3=25a
a= 3/25
jadi fungsi kuadrat ny :
f(x) = 3/25 ( x-3)² -2
f(x) = 3/25( x²-6x+9) -2
f(x) = 3/25 x² - 18/25 x + 27/25 -50/25
f(x) = 3/25 x² - 18/25 x - 23/25