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4x 2 12x 9 0 discriminant
4x 2 12x 9 0
4x 2-9 0
x 2 3 2 4x 2 12
4x2+12x+9
4x2-4x+1 0
12 2-3x 4x+4
4x2-8x+5 0
2 4x-0.5
4x 2+16x+13 0
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