Subtract the second expression from the first expression
$5 x^{2} + 3 x y + 7 y^{2}, 3 x^{2} + x y + 2 y^{2}$

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Solution

Given First expression is $5 x^{2} + 3 x y + 7 y^{2}$
Second expression is $3 x^{2} + x y + 2 y^{2}$
Subtracting second expression from first one will give $5 x^{2} + 3 x y + 7 y^{2} - 3 x^{2} - x y - 2 y^{2} = 2 x^{2} + 2 x y + 5 y^{2}$

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