given 5x+7y=9 and xy=1 find the value of 25xsquare +49ysquare
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5x+7y=9(given)
xy=1
find 25x^2+49y^2
(5x+7y)^2=(9)^2
25x^2+49y^2+70xy=81
25x^2+49y^2+70*1=81 substituting xy=1
25x^2+49y^2=81-70
= 11
xy=1
find 25x^2+49y^2
(5x+7y)^2=(9)^2
25x^2+49y^2+70xy=81
25x^2+49y^2+70*1=81 substituting xy=1
25x^2+49y^2=81-70
= 11
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