From the sum of $4 x^{2} - 3 x y + 7 x$ and $5 x^{2} - 7 x y + 5 x$ subtract $4 x y - 7 x^{2}$

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Solution

According to the question,
Result $= (4 x^{2} - 3 x y + 7 x) + (5 x^{2} - 7 x y + 5 x) - (4 x y - 7 x^{2})$

$= 4 x^{2} - 3 x y + 7 x + 5 x^{2} - 7 x y + 5 x - 4 x y + 7 x^{2}$

$= 4 x^{2} + 5 x^{2} + 7 x^{2} - 3 x y - 7 x y - 4 x y + 7 x + 5 x$

$= 16 x^{2} - 14 x y + 12 x$

Hence, this is the answer.

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