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Pers matriks
(x') = (cos 180 -sin 180) (x)
(y') (sin 180 cos180) (y)
(x') = (-x)
(y') = (-y)
Substitusika x = -x' dan y = -y'
-y' + (x')^2 + 3x' + 4 = 0
Jadi pers bayangan
y = x^2 + 3x + 4