Question

add the following it's fast I mark you siksha year ​

Answer 1

hope it will be helpful

Answer 2

${x}^{2} + {y}^{2} + 2xy + 3 {x}^{2} + {y}^{2} - 4xy + {x}^{2} + {y}^{2} \\ {x}^{2} + {3x}^{2} + {x}^{2} + {y}^{2} + {y}^{2} + {y}^{2} + 2xy - 4xy \\ 5 {x}^{2} + {3y}^{2} - 2xy$