Question

what should be added to 3x²+2xy - y² to obtain x² - 7xy+3y²

Answer 1

Answer:

you have to add

-9xy+4y^2

Answer 2

Answer:

-2x^2-9xy+4y^2

Step-by-step explanation:

3x^2+2xy-y^2 + no. required = x^2-7xy+3y^2

no. required = x^2-7xy+3y^2 - (3x^2+2xy-y^2)

= x^2-7xy+3y^2 - 3x^2-2xy+y^2

= -2x^2-9xy+4y^2