Question

please solve 7 number ​

Answer 1

Answer:

Step-by-step explanation:

A  = 7x^2 +5xy -9y^2

B = 4y^2-3x^2-6xy

C=-4x^2+xy+5y^2

A+B+C = (7 x^2 -3x^2 -4x^2) + (-9y^2 +4y^2 +5y^2 ) + (5xy -6xy +xy)

=0