moongazer 3 years ago How do you solve this ? the fastest way possible :)

1. moongazer

38n^2 + 304n - 128 = -2n^2

2. moongazer

3. Hero

1. Add 2n^2 to both sides first

4. moongazer

5. moongazer

I got 40n^2 + 304n - 128 = 0

6. Hero

2. Factor out 8

7. moongazer

8(5n^2 + 38n - 32)

8. Hero

You forgot the equal zero part

9. moongazer

8(5n^2 + 38n - 32) = 0

10. Hero

3. Divide both sides by 8

11. moongazer

w8 I think I got something wrong

12. Hero

32 x 8 = 256 That definitely isn't right

13. Hero

Did you figure out what you did wrong yet?

14. moongazer

it should be 8(5n^2 + 38n - 16) right?

15. Hero

equal zero :/

16. Hero

You keep forgetting the equal zero

17. moongazer

ok, I'll just try to solve it. I think I am getting confused because I divided 128 by 8 wrongly :) I'll just ask you if am I stuck with some part :)

18. moongazer

8(5n-2)(n+8)=0 (5n-2)(n+8)=0 n=2/5 , n=-8 Is this correct?

19. moongazer

Thanks! I believe it is correct :)

20. Hero

It's correct. Good job