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Hacemos Y = 0 para hallar los punto de corte en eje X
0 = 2X² + 9X - 5
Donde: a = 2; b = 9; c = -5
X1 = [-9 + 11]/4 = 2/4 = 1/2
X2 = [-9 - 11]/4 = -20/4 = -5
Puntos de corte para el eje X se producen en: (1/2 , 0) y (-5 , 0)
ahora hallamos el vertice.
h = [(-b)/(2a)]
h = [(-9)/(2(2))]
h = [-9/4]
h = -2.25
k = [(4ac - b²)/(4a)]
k = [(4(2)(-5) - (9)²)/(4(2))]
k = [(-40- 81)/(8)]
k = [(-121)/(8)]
k = -15.125
Vertice: (h,k) = (-2.25 , -15.125)
Te anexo la grafica