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Help please - I'm DESPERATE
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TieganC
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Joined: 02/02/2015 - 21:54
Posts: 1
Help please - I'm DESPERATE

Could someone please help me with this:

Find all the positive real numbers that satisfy the equation:

x.x^3/x=x^x/x

Thanks very much

albie.hiltonjones
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Joined: 15/02/2015 - 19:49
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20,15,34,25,32

20,15,34,25,32

oyebolaoyetunde4
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Joined: 19/03/2015 - 15:11
Posts: 2
maths

i am not good at statistics and probability and number,algebra for foundation

Bangu Niger
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Joined: 05/03/2015 - 20:40
Posts: 2
maths

Pliz help me with the difference of rational and irrational numbers and give examples

Bangu Niger
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Joined: 05/03/2015 - 20:40
Posts: 2
maths

Pliz help me with the difference of rational and irrational numbers and give examples

Anne789
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Joined: 15/02/2015 - 14:46
Posts: 2
a rational is a number that

a rational is a number that can be written as a simple fraction.  For example: 9 can be written as 9/1 and .25 can be writen as 1/4.

An irraional number is a number that CANNOT be written as a simple fraction, like pi or e.  Also many square roots of non-perfect squares are irrational, like the square root of 3. 

Megan Louise An...
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Joined: 17/03/2015 - 19:28
Posts: 3
Help with maths

You may need to talk this through with a teacher, or go to revision sessions after school if you're not comfortable with some of these maths questions.

You could also look through maths revision books if you are concerned with anything.

Try: 

Past questions and exam papers.

Hope this will help!angel

oyebolaoyetunde4
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Joined: 19/03/2015 - 15:11
Posts: 2
maths

pls help me with maaths

aaron03
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Joined: 21/03/2017 - 12:39
Posts: 3
need suggestion

anyone know about any website to learn algebra ?

ivy21
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Joined: 19/10/2021 - 23:26
Posts: 2
algebra websites

this is super late but bbc bitesize is prety good and covers most basics :)

 

Simeon Williamson
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Joined: 26/08/2022 - 16:03
Posts: 1
Hi, Often the biggest problem

Hi, Often the biggest problem is figuring out exactly what the question is asking!  If I have understood it correctly you can simplify it to x^4=x^x there are two fairly obvious solutions to this equation one where x=4, then we have 4^4=4^4 which is obviously true.  The other solution is x=1.  In that case we have 1^4=1^1.  since 1 times 1 = 1 and similarly 1 times 1 times 1 times 1 = 1 1^4=1 and so does 1^1.  It is very unlikely that there will be any other positive real numbers satisfying this.  Note 0^0 is undefined because it essentially boils down to asking what is zero divided by zero and that way leads to trouble so x=0 isn't really a proper solution and anyway 0 isn't really a positive real number as it is neither positive nor negative being exactly the boundary between positive and negative numbers.

 

I hope that helps.