Question

what should be added to x²+y² to get x² +y²+2xy​

Answer 1

Answer:

answer is 2xy

Step-by-step explanation:

let the required number be k

so, we got an equation that,

x square + y square + k = x square + y square + 2xy

now solve, first of all transfer the x square + y square to R.H.S

so we will get the equation that is ,

k = x square + y square + 2xy - {subtracted by} x square + y square

now conversion of sign

k = x square + y square + 2xy - x square - y square

now + x square and - x square get cut and + y square - y square also get cut { according to the rule }

now only 2xy is remaining .

Hence the value of k is 2xy.

you can also check it by substituting the value,

let me show

x square + y square + k = x square + y square + 2xy

substituting the value of k

now k = 2xy

x square + y square + 2xy = x square + y square + 2xy .

it is your answer {2xy}.