Question

which algebric expression should be added to​

Answer 1

Answer:

g12345678901234567890

Answer 2

Answer:

${3x}^{2} +10xy - {4y}^{2}$

Step-by-step explanation:

${5x }^{2} + 3xy - {y}^{2} \\ {2x}^{2} - 7xy + {3y}^{2}$

by changing sign we get...

$\\ {3x}^{2} + 10xy - {4y}^{2}$