Which operation shows that polynomials are a closed system under addition? (1 point)
Responses
(5x^2+2x+1)+(−2x^2+6x+4)=−3x^2+8x−3
left parenthesis 5 x squared plus 2 x plus 1 right parenthesis plus left parenthesis negative 2 x squared plus 6 x plus 4 right parenthesis equals negative 3 x squared plus 8 x minus 3
(5x^2+2x+1)+(−2x^2+6x+4)=(−2x^2+2x+4)+(5x^2+6x+1)
left parenthesis 5 x squared plus 2 x plus 1 right parenthesis plus left parenthesis negative 2 x squared plus 6 x plus 4 right parenthesis equals left parenthesis negative 2 x squared plus 2 x plus 4 right parenthesis plus left parenthesis 5 x squared plus 6 x plus 1 right parenthesis
(5x^2+2x+1)+(−2x^2+6x+4)=(5x^2−2x^2)+(2x+6x)+(1+4)
left parenthesis 5 x squared plus 2 x plus 1 right parenthesis plus left parenthesis negative 2 x squared plus 6 x plus 4 right parenthesis equals left parenthesis 5 x squared minus 2 x squared right parenthesis plus left parenthesis 2 x plus 6 x right parenthesis plus left parenthesis 1 plus 4 right parenthesis
(5x^2+2x+1)+(−2x^2+6x+4)=3x^2+8x+5
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