Question

What is the sum of the polynomials? (9x4−13x3−x−7)+(7x3−2x+1) A.) −6x^6+9x^4−3x^2−6 B.)−6x^6+9x^4−x−8 C.)9x^4−6x^3−x−8 D.)9x^4−6x^3−3x−6

Answer 1

The answer to the question above is :

D.) 9x^4−6x^3−3x−6

Explanation: In adding polynomials, you have to directly add the similar terms. Always remember that you cannot add dissimilar terms. That is why the correct answer is letter D.

Answer 2

(9x^4-13x^3-x-7)+(7x^3-2x+1)=
9x^4-13x^3-x-7+7x^3-2x+1=
9x^4+(-13+7)x^3+(-1-2)x-7+1=
9x^4+(-6)x^3+(-3)x-6=
9x^4-6x^3-3x-6

Answer: Option D.)9x^4−6x^3−3x−6