Question

Choose the correct sum of the polynomials (4x3 − 2x − 9) + (2x3 + 5x + 3). 6x3 − 3x − 6 2x3 − 7x − 12 6x3 + 3x − 6 2x3 + 3x − 3

Answer 1

(4x^3 - 2x - 9) + (2x^3 + 5x + 3)

= 4x^3 - 2x - 9 + 2x^3 + 5x + 3

= 6x^3 + 3x - 6 (Answer: C)

Answer 2

`6x^3+3x -6`

Explanation:

(4x3 − 2x − 9) + (2x3 + 5x + 3)

`(4x^3 - 2x - 9) + (2x^3 + 5x + 3)`

To add two polynomials, we remove the parenthesis

`4x^3 - 2x - 9+2x^3 + 5x + 3`

To add it , we combine like terms. we add the like terms

`4x^3+2x^3- 2x+ 5x - 9+ 3`

`6x^3+3x -6`