need help (ALGEBRAIC EXPRESSION)

soha · 2006-12-17 02:45:44

i cannot understand this

IF x +1/x=9 and x(rise to 2)+1/x(raise to 2), find the value of x-1/x using special idendities of algebraic expression

krassi_holmz · 2006-12-17 02:50:26

<--what about this? Should be EQUALITY, not expression.

soha · 2006-12-17 03:18:28

suha wrote:

i cannot understand this
IF x +1/x=9 and x(rise to 2)+1/x(raise to 2), find the value of x-1/x using special idendities of algebraic expression

sorry
x(raise to 2)+1/x(raise to 2)=53

sorry for the inconvinience

Last edited by suha (2006-12-17 03:19:55)

basmah · 2006-12-17 05:57:38

i think its more like this

x²+(1/x)²

his ² looks like its only on 1 not on the whole 1/x

anyways...

x²+(1/x)² = 9²

Last edited by basmah (2006-12-17 06:11:18)

luca-deltodesco · 2006-12-17 06:05:24

ok to suha since we seem to be having problems identifying what your saying.

which of these two is the correct translation of your expression

mathsyperson · 2006-12-17 07:46:32

Basmah, your last step is wrong.

Presumably, you've gone from x + 1/x = 9 and squared both sides to get x² + 1/x² = 9².

If you're squaring something with more than one term, then you can't just square each term individually. You need to multiply each term by each other term.

So (x + 1/x)² = x*x + x*1/x + 1/x*x + 1/x*1/x = x² + 2 + 1/x²

soha · 2006-12-17 19:12:22

luca-deltodesco wrote:

ok to suha since we seem to be having problems identifying what your saying.
which of these two is the correct translation of your expression

the first one

George,Y · 2006-12-17 19:27:35

Last edited by George,Y (2006-12-17 19:28:28)

soha · 2006-12-17 19:30:40

how tofractions in maths is fun so that i can say my doubt clearly

also how to write the sign {raise to]

George,Y · 2006-12-17 19:31:09

Last edited by George,Y (2006-12-17 19:32:06)

George,Y · 2006-12-17 19:33:47

Note the maths symbols on top of this page, copy them to your post

krassihomz · 2006-12-18 00:12:43

basmah wrote:

i think its more like this
x²+(1/x)²
his ² looks like its only on 1 not on the whole 1/x
anyways...
x²+(1/x)² = 9²

By

i meant . But I agree with the argument.
The other should be: .
See that the fractal line is a little bit longer?
But in future i'll use brackets.

Stanley_Marsh · 2006-12-18 01:40:19

Using the x^2+1/x^2 =53 ,get (x-1/x)^2=x^2+1/x^2 -2=53-2=51
then x-1/x =51^1/2

Using the x+1/x=9 , get 77

omg ....lol

soha · 2006-12-18 19:57:58

it is confusing

Toast · 2006-12-18 23:12:24

LaTeX is so useful, I think it would benefit everyone a lot if it was used a little more... and it's easy too.

But yes, good job, I think that would have been confusing enough with LaTeX.

soha · 2006-12-24 19:17:10

Can Anyone Solve This Please

George,Y · 2006-12-24 19:28:38

Recommend you to use Latex to express your problem, otherwise no one understands you.

Click here to learn Latex

Here is a simple expression made by Latex:

To show the above, you have to type in the code below:

krassi_holmz · 2006-12-25 11:57:54

No, no!
This system is cracked up!
It doesn't have solutions, so we can't find x-1/x:
Squaring the first equation:

,
but, clearly,
,
so we have no solutions.
That means that using different approaches for finding x-1/x yields to different answers.

soha · 2007-01-12 01:53:02

soha wrote:

i cannot understand this
IF x +1/x=9 and x(rise to 2)+1/x(raise to 2), find the value of x-1/x using special idendities of algebraic expression

its like this:-
if x+

=9 and x²+=53 find the value of x- .

Last edited by soha (2007-01-12 01:53:50)

soha · 2007-01-12 01:54:29

pls help me in this

Toast · 2007-01-12 02:19:15

Huh? The x values differ in each equation.

soha · 2007-01-12 02:24:02

yes .the x values differ

whatever the question is correct
i suppose

soha · 2007-01-20 21:03:42

soha wrote:

soha wrote:
i cannot understand this
IF x +1/x=9 and x(rise to 2)+1/x(raise to 2), find the value of x-1/x using special idendities of algebraic expression
its like this:-
if x+
=9 and x²+
=53 find the value of x-
.

pls help mre urgently

krassi_holmz · 2007-01-21 00:21:00

I told you - the question is wrong. There doesn't exist any x satisfiyng the conditions.

Math Is Fun Forum

#1 2006-12-17 02:45:44

need help (ALGEBRAIC EXPRESSION)

#2 2006-12-17 02:50:26

Re: need help (ALGEBRAIC EXPRESSION)

#3 2006-12-17 03:18:28

Re: need help (ALGEBRAIC EXPRESSION)

#4 2006-12-17 05:57:38

Re: need help (ALGEBRAIC EXPRESSION)

#5 2006-12-17 06:05:24

Re: need help (ALGEBRAIC EXPRESSION)

#6 2006-12-17 07:46:32

Re: need help (ALGEBRAIC EXPRESSION)

#7 2006-12-17 19:12:22

Re: need help (ALGEBRAIC EXPRESSION)

#8 2006-12-17 19:27:35

Re: need help (ALGEBRAIC EXPRESSION)

#9 2006-12-17 19:30:40

Re: need help (ALGEBRAIC EXPRESSION)

#10 2006-12-17 19:31:09

Re: need help (ALGEBRAIC EXPRESSION)

#11 2006-12-17 19:33:47

Re: need help (ALGEBRAIC EXPRESSION)

#12 2006-12-18 00:12:43

Re: need help (ALGEBRAIC EXPRESSION)

#13 2006-12-18 01:40:19

Re: need help (ALGEBRAIC EXPRESSION)

#14 2006-12-18 19:57:58

Re: need help (ALGEBRAIC EXPRESSION)

#15 2006-12-18 23:12:24

Re: need help (ALGEBRAIC EXPRESSION)

#16 2006-12-24 19:17:10

Re: need help (ALGEBRAIC EXPRESSION)

#17 2006-12-24 19:28:38

Re: need help (ALGEBRAIC EXPRESSION)

#18 2006-12-25 11:57:54

Re: need help (ALGEBRAIC EXPRESSION)

#19 2007-01-12 01:53:02

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#20 2007-01-12 01:54:29

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#21 2007-01-12 02:19:15

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#22 2007-01-12 02:24:02

Re: need help (ALGEBRAIC EXPRESSION)

#23 2007-01-20 21:03:42

Re: need help (ALGEBRAIC EXPRESSION)

#24 2007-01-21 00:21:00

Re: need help (ALGEBRAIC EXPRESSION)

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