Question

please tell step by step by vertical method

Answer 1

Step-by-step explanation:

$(8 {x}^{2} + 6xy - 10 {y}^{2} ) + (4xy + 8 {x}^{2} + {y}^{2} ) + (12 {y}^{2} - {x}^{2} + 1) \\ (8 {x}^{2} + 8 {x}^{2} - {x}^{2} ) + ( - 10 {y}^{2} + {y}^{2} + 12 {y}^{2} ) + (6xy + 4xy) + 1 \\ 15 {x}^{2} + 3 {y}^{2} + 10xy + 1$