Mathematics, 26.04.2021 21:00, hamaama

Which of the following equations demonstrate that the set of polynomials is not closed under the certain operations?
A. Subtraction: (3x^4+x^3)-(-2x^4+x^3)=5x^4
B. Addition: (x^2+x)+(x+1)=x^2+2x+1
C. Division: (x^2-5x+3)÷(x-2)=x-3+-3/x-2
D. Multiplication: (x^2-5x+3)(x-5)=x^3-10x^2+28x-15

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Which of the following equations demonstrate that the set of polynomials is not closed under the c...