Hi

1: 



2: sqrt5(2sqrt45 - sqrt5)= 2sqrt(225) - 5 = 30 - 5 = 25

3: 7 /(1- sqrt3) = 7*(1+sqrt(3) )/((1- sqrt3)(1+sqrt(3)) = (-7/2)(1+sqrt(3))

Rules of Exponents:

I.     

II.  

III. 

 

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