Question

What is the sum of the polynomials?

(7x3 – 4x2) + (2x3 – 4x2)
5x3
9x3
5x3 – 8x2
9x3 – 8x2

Answer 1

9x^3 - 8x^2 is the answer. to solve this you must distribute the sign across each parenthetical and then add the like terms (all cubed x variables added to cubed variables and all squared x variables added to squared variable)

Answer 2

Answer: Last option is correct.

Explanation:

Since we have given that

`7x^3-4x^2+2x^3-4x^2`

We need to find the sum of the polynomials:

So, we first collect the like terms:

`7x^3-4x^2+2x^3-4x^2\\\\=7x^3+2x^3-4x^2-4x^2\\\\=9x^3-8x^2`

Hence, the sum of polynomials is
`9x^3-8x^2`

Therefore, Last option is correct.