+0  
 
+5
687
6
avatar

Find x

 Oct 15, 2015

Best Answer 

 #4
avatar+109812 
+20

\(\sqrt{X+\sqrt{X+\sqrt{X+...}}}=5\\ Let\\ Y= \sqrt{X+\sqrt{X+\sqrt{X+...}}}\qquad where\;\;\;Y=5\\ Now\\ \sqrt{X+Y}=5\\ X+Y=25\\ but\; Y=5\\ X+5=25\\ X=20\)

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 Oct 15, 2015
 #1
avatar+94 
+5

X is equal to 20

 Oct 15, 2015
 #2
avatar
+10

And why?

 Oct 15, 2015
 #3
avatar
+5

x=x^(1/2^y)=5, where y=the number of nested squares.E.g., if you have 5 nested squares, then y would be 2^5=32. So x^1/32=5.

 Oct 15, 2015
 #4
avatar+109812 
+20
Best Answer

\(\sqrt{X+\sqrt{X+\sqrt{X+...}}}=5\\ Let\\ Y= \sqrt{X+\sqrt{X+\sqrt{X+...}}}\qquad where\;\;\;Y=5\\ Now\\ \sqrt{X+Y}=5\\ X+Y=25\\ but\; Y=5\\ X+5=25\\ X=20\)

Melody Oct 15, 2015
 #5
avatar
0

Thanks YangShizzle,Melody and Guest for anweser my question!smiley

Melody ,that is a very cool way to do it!

 Oct 15, 2015
 #6
avatar+2498 
0

i think this way is easear

sqrt{X+\sqrt{X+\sqrt{X+...}}}=5

sqrt{5x4+\sqrt{5x4+\sqrt{5x4+...}}}=5 if it is + you will bring 5 if it is - you will bring 4

let s say:

sqrt{12+\sqrt{12+\sqrt{12+...}}}=x

we can write it like 

sqrt{4x3+\sqrt{4x3+\sqrt{4x3+...}}}=x  so x will be 4 because + we choosing bigger one 

 Jan 3, 2016
edited by Solveit  Jan 3, 2016

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