The operation is a closed system under subtraction because when you subtract one polynomial from another, like (9x² + 17x + 13) - (2x² + 12x + 11), you end up with another polynomial. This means you’re still working with the same type of math object (polynomials), which keeps everything inside the "closed system."
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
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