## ChristaB Group Title Multiplying Polynomials using the FOIL process. Can anyone help me? 2 years ago 2 years ago

1. ChristaB

\[(X + 4) ^{3}\] ---- I am lost on the step by step (showing my work) -

2. saifoo.khan

|dw:1352972916740:dw|

3. ChristaB

Its cubed

4. saifoo.khan

Oh, okay. Then write it this way:|dw:1352973007354:dw|

5. ChristaB

I wrote out step one as: \[( X +4) ^{2} (x +4)\] --- But then I loose it and have no idea what to do after that

6. saifoo.khan

Next: |dw:1352973075697:dw|

7. ChristaB

\[X ^{2} + X ^{4}+4(X) + 4 (4) + (X + 4)\]

8. saifoo.khan

Noe.

9. dpaInc

nice save @saif! :)

10. saifoo.khan

Next will be:|dw:1352973489598:dw|

11. ChristaB

No wait... \[X ^{2 + X (4) + 4(X) 4 (4) + (X + 4)}\]

12. emilie.li

may not be right, but here's a shot: (x+4)(x+4)=X ^{2}+8x+16 then multiply that by (x+4)

13. ChristaB

The book gives the answer as: \[X ^{3 }+ 12X ^{2}+ 48X + 64 ---- AS you can see... I have no idea how to get from my last post to this answer...Im lost

14. saifoo.khan

The working we showed isn't the final step. :P

15. emilie.li

|dw:1352973951215:dw|

16. emilie.li

that should give you the answer in the book

17. ChristaB

Got it... thank you. Of the 108 problems in this chapter, I have one other that I am struggling with... If your up for the assistance, I will close this one out and post the other problem??