thinhalex2005
thinhalex2005 thinhalex2005
  • 24-02-2020
  • Mathematics
contestada

Find p such that p+1=2x^2, p^2+1=2y^2. Know that p is a prime, x and y are positive integers.​

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yasmitadp yasmitadp
  • 24-02-2020

Answer:

Step-by-step explanation:

Given p + 1 = 2[tex]x^{2}[/tex]       → 1 = 2[tex]x^{2}[/tex] - p

         [tex]p^{2} + 1 = 2y^{2}[/tex]

        [tex]p^{2} + (2x^{2} - p) = 2y^{2}[/tex]

     [tex]p^{2} - p + (2x^{2} - 2y^{2} ) = 0[/tex]

The above equation is quadratic in p.

p = [ -(-1) ± [tex]\sqrt{(-1)^{2} - 4* 1*(2x^{2} - 2y^{2} )[/tex] ]  ÷ 2

p =  [1 ± [tex]\sqrt{1 - 8(x^{2}-y^{2} )}[/tex]]  ÷ 2

       

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