Mathematics, 20.02.2020 20:03 naseem94

ATTENTION HELP PLEASE (Will give brainlist)

Which of the following equations demonstrate that the set of polynomials is not closed under the certain operations?

A. Multiplication. (3x^4+x^3)(-2x^4+x^3)=-6x^8+x^7+x^6

B. Addition: (3x^4+x^3)+(-2x^4+x^2x^4+2x^2

C. Division: (x^2+2x_+(x+1)=x+x/x+1

D. Multiplication: (x^2+2x)(x+1)=x^3+3x^2+2x

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