Question

add: 5x²-3xy+4y²-9,7y²+5xy-2x²+12​

Answer 1

Step-by-step explanation:

$(5 {x}^{2} - 3xy + 4 {y}^{2} - 9) + (7 {y}^{2} + 5xy - 2 {x}^{2} + 12 ) \\ = 5 {x}^{2} - 3xy + 4 {y}^{2} - 9 + 7 {y}^{2} + 5xy - 2 {x}^{2} + 12 \\ = 5 {x}^{2} - 2 {x}^{2} + 4 {y}^{2} + 7 {y}^{2} + 5xy - 3xy + 12 - 9 \\ = 3 {x}^{2} + 11 {y}^{2} + 2xy + 3$

Answer 2

Answer: First we Add the no. Of same variables.

Second change the sign

Step-by-step explanation:

= 5x²+(-2x²)+(-3xy)+5xy+4y²+7y²+(-9)+12

= 5x²-2x²-3xy+5xy+4y²+7y²-9+12

= 3x²+2xy+11y²+3

This the answer -3x²+2xy+11y²+3

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