if 3x-7y=10 &xy= -1. find the value of 9x^2+49y^2. plzz solve
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58;
(3x-7y)^2=100
9x^2+49y^2-42xy=100
where 42xy=-42
so 58
(3x-7y)^2=100
9x^2+49y^2-42xy=100
where 42xy=-42
so 58
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