Question

Please solve these.. It is really important

Answer 1

$( {x}^{2} - 2xy + {y}^{2} + {x}^{2} + 2xy + {y}^{2} ) -\\( {x}^{2} - 4xy + 4 {y}^{2} ) \\ = (2 {x}^{2} + 2 {y}^{2} ) - {x}^{2} + 4xy - 4 {y}^{2} \\ = {x}^{2} + 4xy - 3 {y}^{2}$
hope it helps you