The expression of parabola y = ax ^ 2 + BX through D (4,3) a (6,0)

3=16a+4b
0=36a+6b
Finishing 16A + 4B = 3 (1)
6a+b=0
From 6A + B = 0 we get b = - 6a to (1) we get 16a-24a = 3, a = - 3 / 8, B = 9 / 4
y=（-3/8）x^2+(9/4)x

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