E Maths Algebra

<(0))>< SG

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 SG

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 SG

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

solve for a

<(0))>< SG

ok i get it
thx~