Find The Parabola Function Help?

y= a(x-0.75)^2+128.
I don't know how to find a? I've attached the data table... Please explain how you found it, it's a transfer task.

Bryce2016-12-14T01:38:19Z

x=0, 88=a(3/4)² + 128; a= -640/9

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