## allyza_obico 4 years ago by foil method: (15x + 7y) (15x-7y)

1. fiddlearound

where are you stuck with it ?

2. fiddlearound

would you like to try, so we see where the difficulty is ?

3. allyza_obico

??

4. allyza_obico

5. Mimi_x3

225x^2 - 49y^2

6. fiddlearound
7. allyza_obico

with solution plss

8. successboye79

arctan(-1)

9. Mimi_x3
10. fiddlearound

Mimi , wolfram didn't use FOIL though :)

11. Mimi_x3

lols i know, its obvious that she just wanted the answer (:

12. fiddlearound

allyza do you want to try doing the FOIL method ?

13. fiddlearound

First Outer Inner Last Only 4 easy things to do ...

14. fiddlearound

we can do it step by step , if you want to

15. fiddlearound

and we even know what the answer will be in the end :)

16. Mimi_x3

|dw:1316602830211:dw|

17. autumn.epic

(15x + 7y) (15x-7y) (F) 15x * 15x = __ (O) 15x * -7y = __ (add this one...) (I) 7y * 15x =__ (...and this one together for your xy value.) (L) 7y * -7y =__ so, F (+/-) O+I (+/-) L

18. Mimi_x3

225x^2 - 49y^2 btw

19. fiddlearound

|dw:1316603089681:dw|