Question

From the sum of 2x2 + 3xy – y2 and 4x2 – 6xy + 3y2, subtract 7x2 + xy – 5y2. ​

Answer 1

Answer:

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Answer 2

Answer:

$= 2 {x}^{2} + 3xy - {y}^{2} \\ + 4 {x}^{2} - 6xy + 3 {y}^{2} \\ = 6 {x}^{2} - 3xy + 2 {y}^{2} \\ now \\ = 7 {x}^{2} + xy - 5 {y}^{2} \\ - 6 {x}^{2} + 3xy - 2 {y}^{2} \\ = {x}^{2} + 4xy - 7 {y}^{2}$