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y= -x^2 +27x -162
y= -(x^2 -27x +162)
(27/2)^2 = 729/4 ... sumar y restar.
y= -(x^2 -27x +729/4 -729/4+162)
y= -(x^2 -27x +729/4 -81/4)
y= -[ (x-27/2)^2 -81/4 ]
y= 81/4 -(x-27/2)^2
Coordenada del vértice.
V(x,y) --> V(+27/2, 81/4)
Largo (eje x)= 27/2= 13.5 m.
Ancho (eje y)= 20.25 m
La tabulación es lo más sencillo de realizar... intentalo. Saludos!