Question

Which of the following shows that polynomials are closed under addition when two polynomials 4x + 6 and 2x2 − 8x − 4 are added? 2x2 − 4x + 2; will be a polynomial 2x2 − 4x + 2; may or may not be a polynomial 2x2 − 12x − 10; will be a polynomial 2x2 − 12x − 10; may or may not be a polynomial

Answer 1

A.
`2x^(2) - 4x + 2` ; will be a polynomial

Explanation:

(4x + 6) + (2x² - 8x - 4)

= 4x + 6 + 2x² - 8x - 4

= 2x² + (4x - 8x) + (6 - 4)

= 2x² - 4x + 2

Polynomial (it has more than 1 term)

Hope that help!

Answer 2

The answer is a

Step-by-step explanation

2x2 - 4x + 2 will be a polynomial

(4x + 6) + (2x² - 8x - 4)

= 4x + 6 + 2x² - 8x - 4

= 2x² + (4x - 8x) + (6 - 4)

= 2x² - 4x + 2

And it is polynomial (it has more than 1 term)