expand brackets (1+√ 5) (2+√ 5)

8 ANSWERS

1. 

   MissM28

   I think you were looking for this way though:
   
   
   (1 + √5) (2 +√5)
   = (1 x 2) + (1 x √5) + (√5 x 2) + (√5 x √5)
   = 2 + 2.23606798 + 4.47213596 + 5
   = 13.70820394
   = 13.71 (2 d.p)
   
   Still the same answer but that's the proper "algebraic" way of doing it :)
   

   Report abuse     Dec 1, 2011 02:22 PM  |   Thumb Up (1)   0 (0)

2. 

   Tammy

   Hello there Zina,
   unfortunately i totally forgot all my algebra as i havent done it in such a long time although i did pull up a few links that can help you in this, http://www.cimt.plymouth.ac.uk/projects/mepres/book8/bk8_8.pdf
   Hopefully someone who knows more than i do in this area can help you with this, sorry =(
   I hope i have helped and be sure to keep yabbing =)

   Report abuse     Dec 1, 2011 01:27 PM  |   Thumb Up (0)   0 (0)

3. 

   cookiemonster

   2 + √ 5 +2 + √ 5 + 5 i think
   

   Report abuse     Dec 1, 2011 01:28 PM  |   Thumb Up (0)   0 (0)

4. 

   winxaaliyah

   i dont know algarbra

   Report abuse     Dec 1, 2011 01:37 PM  |   Thumb Up (0)   0 (0)

5. 

   Zain

   i read this again and i have a feeling you're meant to multiply everything in the first bracket with everything in the second bracket... if that helps at all =/
   
   

   Report abuse     Dec 1, 2011 01:53 PM  |   Thumb Up (0)   0 (0)

6. 

   MissM28

   (1 + 2.24) (2 + 2.24)
   = (3.24) (4.24)
   = 13.71
   
   *All rounded to 1 d.p. - I think that's right, haven't done maths for a while :|

   Report abuse     Dec 1, 2011 02:01 PM  |   Thumb Up (0)   0 (0)

7. 

   MissM28

   I meant *2 d.p :)

   Report abuse     Dec 1, 2011 02:02 PM  |   Thumb Up (0)   0 (0)

8. 

   Nerd

   wow missm28 has explained it very well :)

   Report abuse     Dec 5, 2011 05:36 PM  |   Thumb Up (0)   0 (0)