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Simplify: (2sqrt6-sqrt3)^2

I need all of the steps.
I need this ASAP because this assignment is due tomorrow.
Thanks

1 answer

(2 sqrt6)^2 - 2(2sqrt6sqrt3) + (sqrt3)^2

4(6) - 2(2)sqrt6sqrt3 + 3

24 - 4 sqrt(2*3*3) + 3

24 - 12 sqrt3 + 3

27 - 12 sqrt 3

3 (9 - 4 sqrt3)
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