Answer:
(9.2 , 0)
Explanation:
vertex: (4.6 , 12.2)
parabola: y = a (x-4.6)² + 12.2
pass (0,0): 0 = a (0-4.6)² + 12.2
a = - (12.2/21.16)
2nd root (x , 0): y=0
0 = a (x-4.6)² + 12.2 (x-4.6)² = - 12.2 / a = -12.2 / (- (12.2/21.16)) = 21.16
x - 4.6 = ± √21.16 = ± 4.6
x = 0 or x = 9.2