Answer:
Check the explanation
Step-by-step explanation:
Part A: the sum of Side 1 and Side 2= 5x^2+7x-4
Part B all you have to do is the same thing, but subtract the sum of side 1 and 2 from the total. 5x^3-0x^3=? 4x^2-5x^2=? -x-7x=? -3-4=?
Part C:The closure property states that one polynomial plus another polynomial is also a polynomial. It is the same for addition, subtraction, multiplication, and division
