Question

x²+y²-2xy to get x²+y²+2xy

Answer 1

i am doing addition first :-

question:-

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

Solution:-

⟹x²+y²-2xy-x²+y²+2xy

( Arranging in like terms )

⟹x²-x²+y²+y²-2xy+2xy

⟹2y²

2y² should be added

Now we will do subtract:-

( I Am doing both because you Didn't mentioned it,it depends on the question)

Question:-

What should be subtracted to x²+y²-2xy to get x²+y²+2xy

Solution:-

x²+y²-2xy+x²+y²+2xy

(Arranging in like terms)

⟹x²+x²+y²+y²-2xy+2xy

⟹2x²+2y²

2x²+2y² Should be subtracted.