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How do you multiply # (2sqrt5)^2#?

1 Answer

May 4, 2015

You may use the following:
1] #(x^a)^b=x^(a*b)#
2] #rootn(x^m)=x^(m/n)#
In your case:
#(2sqrt(5))^2=2^2*5^(1/2*2)=4*5=20#

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