Explain what the following statement means: polynomials are closed under the operations of addition and subtraction. provide one addition example and one subtraction example to demonstrate.

After the addition and subtraction of any polynomial with the other polynomial the outcome is a polynomial. The below example is the prove of above statement.

The statement "Polynomial are closed under the operations of addition and subtraction" means that when the addition or subtraction of any polynomial with other polynomial is carried out the outcome is a polynomial.

Example: Add and subtract the polynomial given below-

  and  

Addition:

Subtraction:

So, from the above example it can be concluded that after the subtraction and addition of the polynomial the outcome is a polynomial.

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the answer is 13 cm

step-by-step explanation: