Question

What should be added to x2-3xy+4y2 to get 2x2+7xy-3y2

Answer 1

Answer:

the other number is x^2+10xy-7y^2

Step-by-step explanation:

let a be the number

a + (x^2-3xy+4y^2) = 2x^2+7xy-3y^2

a = (2x^2+7xy-3y^2) - (x^2-3xy+4y^2)

a = 2x^2+7xy-3y^2-x^2+3xy-4y^2

a = 2x^2-x^2+7xy+3xy-3y^2-4y^2

a = x^2+10xy-7y^2

The other number is x^2+10xy-7y^2