You have all the time in the world..try this!

x = √4+√4-√4+......∞
x = ?

10 Answers

1
जय ·

x= √4 + √4-x

1
SatyaPriya Ojha ·

lol..that's ok ..I want the value of x

1
bindaas ·

now reject the roots that has negative x

39
Dr.House ·

no such x exists

atleast thats wat i am getting

62
Lokesh Verma ·

x = √4+√4-√4+......∞
y = √4-√4+√4+......∞

x=√4+y
y=√4-x

4-y2=x
x2-4=y

(x+y)(x-y)=x+y
so x-y=1
so we have
x2-4=x-1
x2-x-3=0
x=1±√132

ignore the -ve value [1]

1
SatyaPriya Ojha ·

You nailed it my friend :)

62
Lokesh Verma ·

for the first 10 minutes i had no clue on how to go about solving this one..

Then i recalled a problem on similar lines

x+√y=7

and y+√x=11

My friend had given it to me when i was preparing for olympiads.. [1]

1
bindaas ·

so mine was right !

1
akshay0035 wakode ·

x = ( 1 + √17 ) / 2

1
pandit ·

hi nishanth
i am not having anything in my mind except that

we have to solve for :

x=(y-11)^2 and
y=(x-7)^2

we have to consider only the root that satisfies

y<11 and x<7

sorry if the answer is dumb

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