Which statement shows how the product of (x + 7)2 demonstrates the closure property of multiplication?

Question

x2 + 14x + 49 is a polynomial
x2 + 14x + 49 may or may not be a polynomial
x2 + 49 is a polynomial
x2 + 49 may or may not be a polynomial

Answer 1

x2 + 14x + 49 is a polynomial, which shows the closure property of multiplication because the product (x + 7)2 results in another polynomial.