Question

add 2x²+4xy-7y² and -5x²+4xy+4y²​

Answer 1

Answer:

Step-by-step explanation:

(2x²+4xy-7y²) + (-5x²+4xy+4y²)

2x²+4xy-7y²-5x²+4xy+4y²    (Remove the Brackets)

2x²-5x² + 4xy + 4xy -7y²+4y² (Group the like terms)

-3x² + 8xy - 3y²                        (Simplified)

Answer 2

Given,

$2x^{2} +4xy-7y^{2}$ and $-5x^{2}+4xy+4y^{2}$

We have to add the given equations

We have to use the + symbol to add the above equations

$=2x^{2} +4xy-7y^{2}+(-5x^{2} +4xy+4y^{2} )$

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

$= -3x^{2} +8xy-3y^{2}$

Therefore, the answer is $-3x^{2} +8xy-3y^{2}$