ON HOMOGENEOUS QUINARY QUADRATIC DIOPHANTINE EQUATION x2+y2+4(z2+w2)=24t2

On Homogeneous Quinary Quadratic Diophantine Equation

S. Vidhyalakshmi 1, M.A. Gopalan 2

1 Assistant Professor, Department of Mathematics, Shrimati Indira Gandhi College, Affiliated to Bharathidasan University, Trichy-620 002, Tamil Nadu, India

2 Professor, Department of Mathematics, Shrimati Indira Gandhi College, Affiliated to Bharathidasan University, Trichy-620 002, Tamil Nadu, India

1. INTRODUCTION

The theory of Diophantine equations offers a rich variety of fascinating problems. In particular, homogeneous, or non-homogeneous quadratic Diophantine equations with two or more variables have been an interest to mathematicians since antiquity Dickson (1971), Mordell (1969), Andre (1984), Datta and Singh (1938). In this context, one may refer Gopalan and Srividhya (2012), Gopalan et al. (2013), Vijayasankar et al. (2017), Vidhyalakshmi et al. (2018), Adiga  (2020) for different choices of quadratic Diophantine equations with four unknowns. In Anbuselvi and Rani (2017), Anbuselvi and Rani (2018), Gopalan et al. (2013) the quadratic Diophantine equation with five unknowns are analysed for obtaining their non-zero distinct integer solutions.

This motivated me for finding integer solutions to other choices of quadratic equations with five unknowns. This paper deals with the problem of determining non-zero distinct integer solutions to the quadratic Diophantine equation with five unknowns given by

2. METHOD OF ANALYSIS

The second-degree Diophantine equation with five unknowns to be solved is

Equation 1

The process of obtaining different sets of non-zero distinct integer solutions

To Equation 1 is exhibited below:

Set 1:

The substitution of the linear transformations

Equation 2

in Equation 1 leads to the Pythagorean equation

Equation 3

which is satisfied by

Equation 4

In view of Equation 2, one has

Equation 5

Thus, Equation 4 and Equation 5 represent the integer solutions to Equation 1

Set 2:

Introducing the linear transformations

Equation 6

in Equation 1 it simplifies to the Pythagorean equation

Equation 7

whose solutions may be taken as

Equation 8

In view of Equation 6 the integer solutions to Equation 1 are given by

Set 3:

Taking

Equation 9

in Equation 1 it reduces to

Equation 10

Treating Equation 10 as a quadratic in z and solving for z, it is seen that  Equation 10 is satisfied by

In view of Equation 9 it is seen that the corresponding values of x, y, w   satisfying  Equation 1 are

Set 4:

Taking

Equation 11

in Equation 1 it reduces to

Equation 12

Treating Equation 12 as a quadratic in z and solving for z, it is seen that  Equation 12 is satisfied by

In view of Equation 11 it is seen that the corresponding values of   satisfying  Equation 1 are

3. CONCLUSION

In this paper, an attempt has been made to obtain non-zero distinct integer solutions to the quadratic Diophantine equation with five unknowns given by  The readers of this paper may search for finding integer solutions to other choices of quadratic Diophantine equations with five or more unknowns.

CONFLICT OF INTERESTS

None.

ACKNOWLEDGMENTS

None.

REFERENCES

Gopalan, M. A. Sangeetha, V. and Somanath, M. (2013). Integral Point on the Quadratic Equation with Four Unknowns, Diophantus J. Math., 2(1), 47-54.

Gopalan, M. A. Vidhyalakshmi, S. and Lakshmi, K. (2013). On the Non Homogeneous Quadratic Equation, International Journal of Applied Mathematical Sciences, 6(1), 1-6.

Gopalan, M. A. Vidhyalakshmi, S. and Lakshmi, K. (2013). On the Non Homogeneous Quadratic Equation, American Journal of Mathematical Sciences and Applications, 1(1), 77-85.