## Solmyr 2 years ago Find the difference of (−5x2 − 4x3 − 3) − (9x3 + 3x − 8x2). Be sure to show all of your work in a neat and organized fashion. Use the ^ (shift 6) symbol to show an exponent. For example, x squared can be written as x^2.

1. Solmyr

(-25x - 64x - 3) - (729x + 3x - 64x) ????

2. Solmyr

3. bronzegoddess

you need to subtract like terms x^2 minus x^2

4. Solmyr

so the -5x^2 and -8x^2?

5. bronzegoddess

yes, and you get?

6. Solmyr

add 8 to boith sides and get 3x^2

7. bronzegoddess

yes your answer is right but your method is fishy.. any go on :) i would say -5x^2--8x^2 = -5x^2+8x^2=3x^2

8. Solmyr

ok

9. bronzegoddess

do the same for the rest, and give me your answer :)

10. Solmyr

-4x^3 and 9x^3

11. bronzegoddess

12. Solmyr

or should the 9 be negative because the minus sign in between the two equations??

13. bronzegoddess

well, the 9 is postive but you have to subtract it from 4..

14. bronzegoddess

-4x^3-9x^3 is the same as -4x^3-+9x^3

15. Solmyr

-13x^3?

16. bronzegoddess

yes, and the last two terms, do they have partners?

17. Solmyr

no

18. bronzegoddess

lol, correct..not the same terms.. so your answer would be all the stuff together.. i'll give you a start: 3x^2-13x^3and the last two terms without partners

19. Solmyr

so 3x^2 - 13^3 + 3x - 3?

20. bronzegoddess

yes :) well done, by the way.. there is a difference between (5x)^2 and 5x^2.. do you know it?

21. Solmyr

no

22. bronzegoddess

(5x)^2= 5^2x^2=25x^2 5x^2 is just 5x^2 :) next time you should write your question with the exponents to avoid complications :)

23. Solmyr

ok thank you for all the help

24. bronzegoddess

you are welcome, you are a great learner :)