Which operation shows that polynomials are a closed system under addition? (1 point)

Question

Responses

(5x2+2x+1)+(−2x2+6x+4)=−3x2+8x−3

(5x2+2x+1)+(−2x2+6x+4)=(5x2−2x2)+(2x+6x)+(1+4)

(5x2+2x+1)+(−2x2+6x+4)=3x2+8x+5

(5x2+2x+1)+(−2x2+6x+4)=(−2x2+2x+4)+(5x2+6x

Answer 1

The correct operation that shows that polynomials are a closed system under addition is:

(5x2+2x+1)+(−2x2+6x+4)=(5x2−2x2)+(2x+6x)+(1+4)