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Let's review what it means for integers to be “closed” under certain operations.

The word integers in black text. The word polynomials in black text. The number negative 1. The number negative 2. A math polynomial that reads 5x to the power of 2 plus 3y minus 2. An math expression that says 3x to the power of 2 plus 5x. A math expression that reads 2x to the power of 2 minus 4x plus 7. The green grass.