find a quadratic function in standard for that has the following points: (1,-2); (2,-2); (3,-4).

find a quadratic function in standard for that has the following points: (1,-2); (2,-2); (3,-4).

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how do i place them in that equation without an a b and c ?

for (1,-2) ..... x=1 and y=-2
==> -2 = a*(1)^2 + b*1 + c
--> -2 = a+b+c

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