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y = a(x-x1)(x-x2)
y = a(x-1)(x-3)
y = a(x^2 - 4x + 3)
y = ax^2 - 4a x+ 3a
y' =0
2ax - 4a = 0
x = 2 --> y = 3
3 = a(2^2) - 4a(2) + 3a
4a-8a+3a = 3
a = 3
y = 3x^2- 12x + 9