Question

plz solve this problem

Answer 1

Hey dear here is your answer!!!!!

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Firstly write this equation as ...

3x² - 5xy  + 4y² -1 + (7y² - 9xy + 5) + ( 7xy - 4x² + y² - 13)

Open up the brackets...

=3x² - 5xy + 4y² -1 + 7y² - 9xy + 5 + 7xy - 4x² + y² - 13

Add the like terms....

= -x² + 12y² - 6xy - 9

❣️⭐ Hope it helps u dear...⭐⭐❣️❣️

Answer 2

Here is your solution

we have to add all terms

$= (3x {}^{2} - 5xy + 4y {}^{2} - 1) + \ (7y {}^{2} - 9xy + 5) + (7xy - 4x {}^{2} + y {}^{2} - 13) \\ \\ = 3x {}^{2} - 5xy + 4y {}^{2} - 1 + 7y {}^{2} - 9xy + 5 + 7xy - 4x {}^{2} + y {}^{2} - 13 \\ \\ = - x {}^{2} + 12y {}^{2} - 7xy - 9$

I hope it helps you