(1-2sqrt3)^2

ginny1029

Junior Member
Joined
Apr 25, 2009
Messages
53
i did the following:

(1-2sqrt3) (1-2sqrt3)

1times 1=1
1 times -2sqrt2 = -2sqrt 3
-2sqrt3 times 1 = -2sqrt3
-2sqrt3 time - 2sqrt3 = 4sqrt 3

so I have
1 - 2sqrt3 - 2sqrt3 + 4 sqrt 3

which leaves me with 1

which is very wrong

help?
 
ginny1029 said:
i did the following:

(1-2sqrt3) (1-2sqrt3)

1times 1=1
1 times -2sqrt2 = -2sqrt 3
-2sqrt3 times 1 = -2sqrt3
-2sqrt3 time - 2sqrt3 = 4sqrt 3 <<< Incorrect

-2 sqrt3 time - 2 sqrt3= (-2)(-2) (?3)(?3) = (4) (3) = 12

so I have
1 - 2sqrt3 - 2sqrt3 + 4 sqrt 3

which leaves me with 1

which is very wrong

help?
 
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