Subtract : $5 x^{2} - 6 y^{2} + 8 y - 5$ from $7 x^{2} - 5 x y + 10 y^{2} + 5 x - 4 y$

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Solution

For subtraction:-
$7 x^{2} - 5 x y + 10 y^{2} + 5 x - 4 y$ For subtraction we change the sign
$5 x^{2} + 0 - 6 y^{2} + 0 + 8 y - 5$

$(7 x^{2} - 5 x^{2}) - 5 x y - 0 + (10 y^{2} + 6 y^{2}) + 5 x - 0 - 4 y - 8 y + 5$

$\Rightarrow 2 x^{2} - 5 x y + 16 y^{2} + 5 x - 12 y + 5$ .

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