box% sage ┌────────────────────────────────────────────────────────────────────┐ │ SageMath version 9.1, Release Date: 2020-05-20 │ │ Using Python 3.8.6. Type "help()" for help. │ └────────────────────────────────────────────────────────────────────┘ sage: R.<x> = QuadraticField(7) sage: A = matrix([[4+2*x,6+x,-x],[x,x,-5+10*x],[1+x,-x,2*x]]) sage: A [ 2*x + 4 x + 6 -x] [ x x 10*x - 5] [ x + 1 -x 2*x] sage: A.determinant() 243*x + 614 sage: x^2 7 sage:
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