Page 110 - aljaber

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AY B

DX C

BCXY ABCD

AB = BC
AD YB
x= 1
1 x −1
x2 −x = 1
x2 −x −1 = 0

x = 1± 5
2

( ) x = 1+ 5 x = AB
AD
2

1 120 ()
2

. 1000

1000 t s .
s − 120 s = 1000
.t = 1000
t
s
.t + 1 1000

2