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• <(0))><

  29 Oct 08, 16:14

  1. Given that x -y = 5 and x^2 - y^2 = 60, find 2(x+y)^2
  
  
  
  
  2.Given that a, b and c are postive values, and that a(a+b) = 13 1/2, (b+c) = 12 1/6
      and  (a+c) 6 1/6.
  
  i)  express b in terms of a(done,ans = 27/2a - a)
  ii) express c in terms of a(done ans = 6 1/6 - a)
  iii)find the values of a

• eagle

  29 Oct 08, 16:18

  1)
  x^2 - y^2 = 60
  (x+y)(x-y) = 60
  (x+y)(5) = 60
  (x+y) = 12
  (x+y)^2 = 144
  2(x+y)^2 = 288

• eagle

  29 Oct 08, 16:19

  2)
  (b+c) = 12 1/6
  Sub in your b in terms of a and c in terms of a

  solve for a

• <(0))><

  29 Oct 08, 16:44

  ok i get it
  thx~