# Thread: Maths problem

1. ## Maths problem

I'm really stuck on this question, and would be incredibly grateful if anyone could help me:

^ = the square root

^5 + y = a rational number (ie a number which can be written as a/b)

can anybody find a value for y? 2. ## Re: Maths problem Originally Posted by gary1
I'm really stuck on this question, and would be incredibly grateful if anyone could help me:

^ = the square root

^5 + y = a rational number (ie a number which can be written as a/b)

can anybody find a value for y?
I'm not sure what you are asking. The value of "y" could be just about anything. 3. ## Re: Maths problem

[Summing a rational number (y) to an irrational one you always obtain
an irrational number. So the only way y is rational is that a is equal to b or an his multiple. for example ^5 or 2*^5 4. ## Re: Maths problem Originally Posted by artax
[Summing a rational number (y) to an irrational one you always obtain
an irrational number. So the only way y is rational is that a is equal to b or an his multiple. for example ^5 or 2*^5
Erm...OK. :wink: 5. I was going to say that. &lt;liar&gt;  6. Originally Posted by tdol
I was going to say that. &lt;liar&gt;   7. Teacher Tdol,

You are correct! She/he is a liar!
One cannot solve an equation with two unknowns!
e.g. a + b = 10

if a is equal one, b will be equal to nine,
However, if a is equal to two, b will be equal to eight and so on.
In conclusion, a and b are variables. 8. Originally Posted by Hong Kong Chinese
Teacher Tdol,

You are correct! She/he is a liar!
One cannot solve an equation with two unknowns!
e.g. a + b = 10

if a is equal one, b will be equal to nine,
However, if a is equal to two, b will be equal to eight and so on.
In conclusion, a and b are variables.
I believe you are right, but I think Tdol was joking by calling himself a liar when he said, "I was going to say that."

:wink: 9. Originally Posted by Hong Kong Chinese
Teacher Tdol,

You are correct! She/he is a liar!
One cannot solve an equation with two unknowns!
e.g. a + b = 10

if a is equal one, b will be equal to nine,
However, if a is equal to two, b will be equal to eight and so on.
In conclusion, a and b are variables.
Thanks for that, but I was calling myself a liar. If I was right, it was only by accident. If I disagreed with someone's view on the forum,I would try to phrase it more diplomatically.  10. Originally Posted by tdol
Thanks for that, but I was calling myself a liar. If I was right, it was only by accident. If I disagreed with someone's view on the forum,I would try to phrase it more diplomatically. I can attest to that fact. :wink: #### Posting Permissions

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