Question

Should
what should be added to x²- y² +2xy to obtain x²+y²+5xy with solution
​

Answer 1

Answer:

required: $2y^2+3xy$

Step-by-step explanation:

Let the number that is to be added be Z

so

$z+x^2-y^2+2xy=x^2+y^2+5xy\\rearrange for z\\z=x^2+y^2+5xy-x^2+y^2-2xy\\z=2y^2+3xy \\That \\ is\\ the\\ required\\ number$

Answer 2

Answer:

2y^2+3xy

Step-by-step explanation:

x^2-y^2+2xy +X = x^2+y^2+5xy

X= x^2 +y^2+ 5xy - x^2-y^2+2xy

X= 2y^2+3xy