Question

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

Refer to this attachment

Answer 2

$2x+y=6 .................. (1)</p><p>2x−y=2 ..................... (2) \\ </p><p></p><p>Add \: equation \: (1) and (2),</p><p></p><p>2x+y+2x−y=6+2</p><p></p><p>4x=8</p><p></p><p>x= </p><p>4</p><p>8</p><p> </p><p> =2</p><p></p><p>Put \: x \: =2 \: in \: equation (1),</p><p></p><p>2(2)+y=6</p><p></p><p>4+y=6</p><p></p><p>y=6−4=2</p><p>$