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y = a(x-p)²+q
y = a(x-2)²-3
melalui (x,y) = (-2,-11)
y = a(x-2)²-3
-11 = a(-2-2)²-3
-11 = a(-4)²-3
-11 = 16a-3
16a = -11+3
16a = -8
a = -8/16
a = -1/2
rumus fungsi:
y = a(x-2)²-3
y = -1/2(x-2)²-3
y = -1/2(x²-4x+4)-3
y = -1/2x²+2x-2-3
y = -1/2x²+2x-5