Which statement justifies that 3x2 - x - 5 multiplied by 2x2 - x - 3 obeys the closure property of multiplication?

The result 6x4 + x2 + 15 has a degree of 4.
The result 6x4 + x2 + 15 is a trinomial.
The result 6x4 - 5x3 - 18x2 + 8x + 15 is a polynomial.
The result 6x4 - 5x3 - 18x2 + 8x + 15 has a degree of 4.

Question

Which statement justifies that 3x2 - x - 5 multiplied by 2x2 - x - 3 obeys the closure property of multiplication?

 The result 6x4 + x2 + 15 has a degree of 4.
 The result 6x4 + x2 + 15 is a trinomial.
 The result 6x4 - 5x3 - 18x2 + 8x + 15 is a polynomial.
 The result 6x4 - 5x3 - 18x2 + 8x + 15 has a degree of 4.

anonymous · Answer

The 3rd one If you multiply 2 polynomials together, you get another polynomial So, the set of all polynomials are closed with respect to multiplication

anonymous · Answer

thankyou vm