Question 213404
5(1/2)^(1/2)-2(8)^(1/2)
=5/(2^(1/2))-2(8)^(1/2)
=(5-2(2)^(1/2)(8)^(1/2))/2^(1/2)
=(5-2(16)^(1/2))/2^(1/2)
=((5-2*4)/2^(1/2))
=(5-8)/2^(1/2)
=-3/2^(1/2)