Question

find the sum of the following polynomial. pls answer this question I will mark u as brainlist​

Answer 1

Step-by-step explanation:

$\: \: \: \: {x}^{4} - {y}^{2} + 3 {y}^{2} \\ - {x}^{4} + 2 {x}^{2}y + {y}^{2} \\ ................................. \\ \\ 0 + 2 { {x}^{2}y - {y}^{2} } + 4 {y}^{2} \\ \\ 4 { {y}^{2} - {y}^{2} + 2 {x}^{2} y} \\ 3 {y }^{2} + 2 {x}^{2} y$