Question

$( {x}^{2} + {y}^{2} )( {x}^{2} + {y}^{2} {)}^{2}$
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Answer 1

Step-by-step explanation:

$= ( {x}^{2} + {y}^{2} )( {x}^{2} + {y}^{2} + 2xy)$

$= {x}^{2} ( {x}^{2} + {y}^{2} + 2xy) + {y}^{2}( {x}^{2} + {y}^{2} + 2xy)$

$= {x}^{4} + {x}^{2} {y}^{2} + 2 {x}^{3}y + {x}^{2} {y}^{2} + {y}^{4} + 2x {y}^{3}$

${x}^{4} + {y}^{4} + 2 {x}^{2} {y}^{2} + 2 {x}^{3} y + 2 x{y}^{3}$

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Answer 2

Hope it will help you.