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1. x2 - 6x + 8 = 0 a=___b=___c=___
2. x2 - 9 = 0 a=____b=______c=____
3. x(x - 4)= 4 a=____b=_____c=____
4. (x + 5) (x - 9)= 0 a=____b=____c=___
5. (2x - 3)2 = 0 a=____b=____c=____​