## iloveboys Group Title Simplify -3(d - 3) + 5d 2 years ago 2 years ago

1. hyunaelee

-3d+9+5d = 2d+9

2. iloveboys

??

3. TuringTest

first use the distributive property we just discussed, what do you get?

4. TuringTest

5. iloveboys

What is above

6. TuringTest

just do this part first: simplify -3(d - 3) and tell me what you get

7. iloveboys

I dont know

8. TuringTest

remember the distributive property? a(b+c)=ab+ac use that on -3(d-3) and tell me what you get.

9. iloveboys

d

10. hyunaelee

Multiply D by -3 and multiply -3 by -3. So d*-3= ? and -3*-3=?

11. TuringTest

here is an illustratino of distribution for your problem:|dw:1324426554049:dw|

12. TuringTest

see how the -3 gets "distributed"?

13. iloveboys

So, it would be -3d?

14. TuringTest

the first term is -3d but what about (-3)(-3)?

15. TuringTest

|dw:1324426739226:dw|(negative times negative is positive, in case you forgot)

16. iloveboys

6d

17. iloveboys

Oh crapp... that its!

18. iloveboys

What ifyou would do 1over 2 (g-16)

19. TuringTest

you believe that -3d+9=6d no remember to only combine "like terms" I will tell you that -3d+9 cannot be simplified As to your second question, we haven't even answered the first! Remember, one step at a time!

20. TuringTest

-3d+9d=6d because they both have a "d" in them but -3d+9 has no "d" next to the 9, so it cannot be simplified now let's remember our original problem: -3(d - 3) + 5d we have established that -3(d-3)=-3d+9 so we now have -3d+9+5d can you simplify that?

21. iloveboys

yes... 2d+9

22. iloveboys

a i correct?

23. TuringTest

yes, nice job. Please focus on the part you had trouble with -3(d-3)=-3d+9 and see how it follows the distributive property, which is a(b+c)=ab+ac

24. iloveboys

Thanks agian lol