Hmm.. Not sure if this is right but heres what I would do
A =(3/2) x (A^2) x √3
A = (3/2) x (2A) x √3
-2A -2A
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-A = (3/2) x √3
-A = 1.5 x 1.7320508075688772
-A = about 2.6
A = about -2.6
Hope this helped!
Sorry! Forget the above answer.
I thought a^2 meant a (times) 2
therefore the answer is wrong