Question

find the sum 2x²+xy-y² , -x²+2xy+3y² , 3x²-3x+1​

Answer 1

Answer:

5x

2

−2xy+3y

2

,−2x

2

+5xy+9y

2

and 3x

2

−xy−4y

2

It can be written as

= 5x

2

−2xy+3y

2

,−2x

2

+5xy+9y

2

+3x

2

−xy−4y

2

By further calculation

5x

2

−2xy+3y

2

,−2x

2

+5xy+9y

2

3x

2

−xy−4y

2

So we get

=6x

2

+2xy+8y

2