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Question Number 188442 by BaliramKumar last updated on 03/Mar/23

  Solve by computer programing  (if possible)                  d<a<b & c < a, b>2c  a^2 +b^2 = 5c^2 +2d^2             (a, b, c, d  ∈ N)  c^2 +d^2  = a^2         .........(i)  (2c)^2 +d^2  = b^2   .........(ii)                       (a, b, c, d) = ?

$$ \\ $$ $${Solve}\:{by}\:{computer}\:{programing} \\ $$ $$\left({if}\:{possible}\right)\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:{d}<{a}<{b}\:\&\:{c}\:<\:{a},\:{b}>\mathrm{2}{c} \\ $$ $$\cancel{{a}^{\mathrm{2}} +{b}^{\mathrm{2}} =\:\mathrm{5}{c}^{\mathrm{2}} +\mathrm{2}{d}^{\mathrm{2}} }\:\:\:\:\:\:\:\:\:\:\:\:\left({a},\:{b},\:{c},\:{d}\:\:\in\:\mathrm{N}\right) \\ $$ $${c}^{\mathrm{2}} +{d}^{\mathrm{2}} \:=\:{a}^{\mathrm{2}} \:\:\:\:\:\:\:\:.........\left({i}\right) \\ $$ $$\left(\mathrm{2}{c}\right)^{\mathrm{2}} +{d}^{\mathrm{2}} \:=\:{b}^{\mathrm{2}} \:\:.........\left({ii}\right) \\ $$ $$ \\ $$ $$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\left({a},\:{b},\:{c},\:{d}\right)\:=\:? \\ $$

Answered by nikif99 last updated on 02/Mar/23

Many solutions (26 for a, b, c, d ≤30)

$${Many}\:{solutions}\:\left(\mathrm{26}\:{for}\:{a},\:{b},\:{c},\:{d}\:\leqslant\mathrm{30}\right) \\ $$

Commented bynikif99 last updated on 02/Mar/23

Commented byBaliramKumar last updated on 03/Mar/23

now 2 equations&..⇊  a>d  a>c  b>a  b>2c  b>d

$${now}\:\mathrm{2}\:{equations\&}..\downdownarrows \\ $$ $${a}>{d} \\ $$ $${a}>{c} \\ $$ $${b}>{a} \\ $$ $${b}>\mathrm{2}{c} \\ $$ $${b}>{d} \\ $$

Commented byBaliramKumar last updated on 03/Mar/23

Commented bynikif99 last updated on 03/Mar/23

No integer solution for a, b, c, d ≤1000

$${No}\:{integer}\:{solution}\:{for}\:{a},\:{b},\:{c},\:{d}\:\leqslant\mathrm{1000} \\ $$

Commented byBaliramKumar last updated on 03/Mar/23

Thanks Sir      for information

$${Thanks}\:{Sir}\:\:\:\:\:\:{for}\:{information} \\ $$

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