Which of the following shows that polynomials are closed under subtraction when polynomial x + 5 is subtracted from 3x2 + 2x − 6? 3x2 + x − 11 may or may not be a polynomial 3x2 + x − 11 will be a polynomial 3x2 + x − 1 will be a polynomial 3x2 + x − 1 may or may not be a polynomial

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.