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melalui (x,y)=(4, -1)
.
y = a(x-p)^2 + q
y = a(x-2)^2 - 4
melalui (4, -1) --> -1 = a(4-2)^2 - 4
-1= 4a - 4
4a =3
a= 3/4
.
rumus fungsi --> y = f(x) =3/4(x-2)^2 - 4
f(x)= 3/4 (x^2 - 4x + 4) -4
f(x) = 3/4 x^2 - 3x +3 -4
f(x)= 3/4 x^2 - 3x - 1