SOLUTION: if n is a positive number,which of the following is equal to 8n ? (A) sqrt(64n) (B) sqrt(8n^2) (C) sqrt(16n^2) (D)2 sqrt(4n) (E) 4 sqrt(4n^2)

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Question 305358: if n is a positive number,which of the following is equal to 8n ?
(A) sqrt(64n) (B) sqrt(8n^2) (C) sqrt(16n^2) (D)2 sqrt(4n) (E) 4 sqrt(4n^2)

Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
if n is a positive number,which of the following is equal to 8n ? 


(A) sqrt%2864n%29 

sqrt%2864n%29=sqrt%2864%29sqrt%28n%29=8sqrt%28n%29

Nope, that's not 8n


(B)  


Nope, that's not 8n


(C) sqrt%2816n%5E2%29=sqrt%2816%29sqrt%28n%5E2%29=4n 

Nope, that's not 8n


(D) 2sqrt%284n%29=2sqrt%284%29sqrt%28n%29=2%2A2%2Asqrt%28n%29=4sqrt%28n%29 

Nope, that's not 8n


(E) 4sqrt%284n%5E2%29=4sqrt%284%29sqrt%28n%5E2%29=4%2A2%2An=8n 

Yeppers, that's 8n

So (E) is the correct choice

Edwin