Mister Exam

−4x1x2+8x1x3+9x1x4+8x2x3+4x2x4−2x3x4 canonical form

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-4*x1*x2 - 2*x3*x4 + 4*x2*x4 + 8*x1*x3 + 8*x2*x3 + 9*x1*x4 = 0
$$- 4 x_{1} x_{2} + 8 x_{1} x_{3} + 9 x_{1} x_{4} + 8 x_{2} x_{3} + 4 x_{2} x_{4} - 2 x_{3} x_{4} = 0$$
-4*x1*x2 + 8*x1*x3 + 9*x1*x4 + 8*x2*x3 + 4*x2*x4 - 2*x3*x4 = 0