Question

5x-3y=21 and xy= -6 find
25 {x}^{2} - 9 {y}^{2}25x2−9y2


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Answer 1

Answer:

5x-3y=21

and xy=-6

25x^2-9y^{2}25×2-9y2

25x^2-9{y}^{2}50-18y

25x^2-450y^2-18y