#y = ax^2 + bx + c#
#a(-1)^2 + b(-1) + c = 2#
#x_V = -2 = -b/(2a)#
#y_V = -3 = - Delta / (4a)#
#b = 4a#
#3 = ((4a)^2 - 4ac)/(4a) Rightarrow 3 = 4a - c Rightarrow c = 4a - 3#
#a -b + c = 2#
#a - 4a + 4a - 3 = 2 Rightarrow a = 5#
#b = 4*5, c = 4*5 - 3#