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Understand that polynomials form a system analogous to the integers, namely, they are closed under the operations of addition, subtraction, and multiplication; add, subtract, and multiply polynomials.
In this case, we performed subtraction on two elements from the set of polynomials and the result was another polynomial - that is because the set of polynomials is closed under subtraction. Whether a set is closed or not becomes very important in later math.
The closure property for polynomials states that the sum, difference, and product of two polynomials is also a polynomial. However, the closure property does not hold for division, as dividing two polynomials does not always result in a polynomial. Consider the following example: Let P(x)=x2+1 and Q(x)=x.
If the subtraction of two numbers in a given set of numbers belongs to the set, then we say that the given set of numbers is closed under subtraction. This property is applicable for real numbers, integers, and rational numbers. Real number (a, b are real numbers.) Rational number (a, b are real numbers.)
Closure Property: When something is closed, the output will be the same type of object as the inputs. For instance, adding two integers will output an integer. Adding two polynomials will output a polynomial. Addition, subtraction, and multiplication of integers and polynomials are closed operations.
Understand that when you subtract polynomials, you still get a polynomial, showing that the set of polynomials is 'closed' under subtraction.
In mathematics, the set of polynomials is not closed under division. This is because when you divide one polynomial by another, the result may not always be a polynomial. For instance, if we consider the polynomials P(x) = x2 and Q(x) = x.
If all the boundary points are included in the set, then it is a closed set. If all the boundary points are not included in the set then it is an open set. For example, x+y>5 is an open set whereas x+y>=5 is a closed set. set x>=5 and y<3 is neither as boundary x=5 included but y=3 is not included.