We can find two irrational numbers x and y to make xy rational,true or false

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SUMMARY

The statement that two irrational numbers \(x\) and \(y\) can be found such that \(x^y\) is rational is true. A well-known example is when both \(x\) and \(y\) are set to \(\sqrt{2}\). In this case, \(x^y = \sqrt{2}^{\sqrt{2}}\) may be either rational or irrational. If it is irrational, setting \(x = \sqrt{2}^{\sqrt{2}}\) and \(y = \sqrt{2}\) leads to \(x^y = 2\), which is rational. Another example includes \(\sqrt{2}^{\log_2 9} = 3\), further confirming the existence of such irrational pairs.

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  • Familiarity with exponentiation and logarithms
  • Knowledge of properties of square roots
  • Basic concepts of rational and irrational numbers
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  • Learn about the implications of exponentiation with irrational bases
  • Study logarithmic functions and their applications in rationality
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Mathematicians, educators, students studying number theory, and anyone interested in the properties of irrational numbers and their relationships with rational numbers.

Albert1
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we can find two irrational numbers $x$ and $y$
to make $x^y$ rational,true or false statement?
if true then find else prove it .
 
Last edited:
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Albert said:
we can find two unreasonable numbers $x$ and $y$
to make $x^y$ reasonable,true or false statement?
if true then find else prove it .

what is a reasonable number ?
 
kaliprasad said:
what is a reasonable number ?
sorry it should be edited as :
$x,y $ irrational numbers
$ x^y$ rational number
 
Here's a famous example. Let x= y= \sqrt{2}. Either x^y= \sqrt{2}^\sqrt{2} is irrational or it is rational. If it is rational we are done. If it is irrational, let x= \sqrt{2}^\sqrt{2} and y= \sqrt{2}. Then x^y= (\sqrt{2}^\sqrt{2})^\sqrt{2}= \sqrt{2}^{(\sqrt{2}\sqrt{2})}= \sqrt{2}^2= 2. In either case, there exist two irrational numbers, x and y, such that x^y is rational.
 
Another example is $\sqrt{2}^{\log_29}=3$.
 

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