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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

if i plug it in wouldnt a still be squared or somethin ?

a is not squared ... the "x" is squared

oh. okay
so after i do that do i add all of them together ?

well you need to know how to solve a system of 3 equations

what do you mean ?

im trying to write down and figure which numbers can work for all three

a=-1
b=3
c=-4

y=-1x^2 + 3x -4

thank you