Question 128255
3sqrt(80)a^7b^5/3sqrt(10)a^5b^4
=sqrt(80)a^2b/sqrt(10) The 3's cancel subtract exponents when dividing.
=4sqrt(5)a^2b/sqrt(5*2) 
=4a^2b/sqrt(2)
=4sqrt(2)a^2b/2 Multiply by sqrt(2)/sqrt(2)
=2sqrt(2)a^2b
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Ed