Solving problems

Question

What is the sum of -x^2+3x-5 and 3x^2+x-8?

Answer 1

So, we need to find the sum so we have to add the two expressions. We have -x²+3x-5+3x²+x-8

Now, we combine like terms. -x²+3x² gives 2x²; 3x+x gives 4x; -5-8 gives -13. So, the final answer would be 2x²+4x-13

Answer 2

Hi Sarai,

Here we would just combine like terms. You do not have to switch any of the signs in either term because you are adding.

(-x^2+3x-5) + (3x^2+x-8)

-x^2 + 3x - 5 + 3x^2 + x - 8

-x^2 + 3x^2 +3x +x - 5 - 8

2x^2 + 4x - 13

Answer 3

Based on your question, it looks like you are adding polynomials. To do so, you will need to combine like terms. In other words, add the coefficients of your x^2 then the x's, and lastly the constants.

-x^2 + 3x - 5 + 3x^2 + x - 8

(-x^2 + 3x^2) + (3x +x) + (-5 -8)

2x^2 + 4x - 13

Hopefully, this helped.