Square root greater than its Square? Impossible!

Algebra Level 1

Let x x be a real number such that the square root of x x is greater than the square of x x . Which of the following is a possible value of x x ?

1 4 \frac{1}{4} 1 1 4 4 9 4 \frac{9}{4}

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23 solutions

Vibhuti Kumar
Nov 28, 2014

We know that square of any value b/w 0<x<1, then its resultant value less than its original value. apply square both side, here only one value 1/4

be careful the Question isn't Right

Omar Ahmed - 5 years, 6 months ago

x > x 2 , s q u a r i n g b o t h s i d e s , x > x 4 i s t h e c o n d i t i o n . F o r 1 < x < 1 : i f n > 1 , x n < x . n = 4 > 1. S o w e s h o u l d h a v e , n u m b e r x < 1. 1 / 4 i s t h e o n l y s u c h n u m b e r f r o m t h e l i s t . A n s w e r = 1 / 4 . \sqrt{x}>x^2,~~~~~squaring~ both~ sides,~~x>x^4 ~is~the~condition.\\ For~-1<x<1:-~~~~~~if~~ n>1, ~~x^n<x.\\ n=4>1.~~So~we~should~have,~number~|x|<1.\\ 1/4~~is ~the~only~such~number~from~the~list.\\ Answer=\color{#D61F06}{1/4}.

Syauqi Ramadhan
Nov 28, 2014

I chose 1 4 \frac{1}{4} , because:

1 4 = 1 2 \square{\frac{1}{4}}=\frac{1}{2}

so 1 2 > 1 4 \frac{1}{2}>\frac{1}{4}

root of 1/4 is 1/2, that is 0.5.. square of 1/4 is 1/16, that is 0.0625.. therefore 0.5 is greater than 0.0625

Sandeep Rathod
Nov 21, 2014

The numerator should be minimum as possible, it can't be zero since square root of 0 is equal to square of zero . Thus it should be one , only one option contains it .

Parveen Soni
Nov 21, 2014

Check for the given options as per given condition

If a < b a<b then ( a b ) 2 = a 2 b 2 (\frac{a}{b})^2=\frac{a^2}{b^2} which is smaller because b a < b 2 a 2 b a < ( b a ) ( b + a ) b-a<b^2-a^2 \implies b-a<(b-a)(b+a)

It simply telling that x<1... So just option checking..😉

John Lewis
Mar 6, 2015

Let x=1/4, and 1/4=0.25 and its(1/4) square root is 0.5 while the square of 1/4 =0.0625. Thus, x = 1/4 in that the square root of 1/4 which is 0.5 is > then (1/4)^2 which is 0.0625.

Monish Kumar PS
Jan 29, 2015

1/4=1/2 so 1/2=1/4

WHAT!!!!! 😨😨

MD Omur Faruque - 5 years, 11 months ago
Anish Harsha
Dec 16, 2014

Yah ! 3000 solvers.

Tan Kiat
Nov 30, 2014

x > x 2 = > x > x 4 \sqrt{x} > x^2 => x > x^4

Thus for any value of x x for which 1 < x < 1 -1 < x < 1 excluding 0 0 , the multiple of itself will yield a value less than itself (i.e 0.5 x 0.5 = 0.25 < 0.5)

So hence, x = 1 4 \boxed{x = \frac{1}{4}}

Ifham Shahid
Nov 30, 2014

because the square of 0<x<1 is smaller always than their respective square roots :)

Anuraz Rajput
Nov 30, 2014

if any no is less then one the its square is always less then square root of it self

Dave Guron
Nov 29, 2014

If x = 1/4 then 1/4 ^ 1/2 is equal to 1/2 which is equal to the square root of x

x^1/2 > x ; 1/2 >1/4

Mithlesh Tiwari
Nov 28, 2014

1\4 is than 1\2

Ishtiaq Ahmad
Nov 28, 2014

let x=1/4 then square root of 1/4 is 1/2 so 1/2=.5 is greater than 1/4=.25. so ans is 1/4. best wishes next

Hamza Ali Zafar
Nov 28, 2014

sqrt(1/4) = 1/2, half is greater than 1/4

Mourad Shafik
Nov 27, 2014

Write a solution.

Gill Gill
Nov 27, 2014

sqrt(1/4)=0.5 >(1/4) ((0.5)^2) basically given any real number n, such that 0<n<1 will satisfy the given condition for further explanation try graphing both y=sqrt(x) and y=x on the same axis

Rahul Pagidimarri
Nov 27, 2014

which is greater value cos6 or cos60

Henrique Ribeiro
Nov 27, 2014

1/4 = 0,25. √0,25 = 0,5. This satisfies the proposition.

Write a comment or ask a question...how a square root can be greater than its square even square root can be imaginaryy too ? pls answer

Kumar Picasso - 5 years, 5 months ago

x > x \sqrt{x} > x will happen when 0 < x < 1 0 < x < 1

Then, the answer is 1 4 \frac{1}{4} .

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