In 1–2 sentences, explain why the following operation is a closed system under subtraction.

(9x2+17x+13)−(2x2+12x+11)


say it like how a 8th grader would and easy enough to copy and paste

1 answer

The operation is a closed system under subtraction because when you subtract one polynomial from another, the result is still a polynomial. So, even after subtracting, you're left with a polynomial expression that follows the same rules as the originals.