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If 4a^2+c^2=b^2-4a c , then the variable...

If `4a^2+c^2=b^2-4a c ,` then the variable line `a x+b y+c=0` always passes through two fixed points. The coordinates of the fixed points can be `(-2,-1)` (b) `(2,-1)` `(-2,1)` (d) `(2,1)`

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