Question

$y3 - y2 - y - 1$
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Answer 1

Refer to the attachment..

Answer 2

$olution:

$formula : - \: (y-a)(y-b)$

$The \: value \: of \: {y}^{3} + {y}^{2} −y−1 \: is$

${y}^{3} − {y}^{2} +2 {y}^{2} −2y+y−1$

$= {y}^{2} (y−1)+2y(y−1)+1(y−1)$

$=(y−1)( {y}^{2} +2y+1)$

$=(y−1)[ {y}^{2} +y+y+1]$

$=(y−1)[y(y+1)+1(y+1)]$

$=(y−1)(y+1)^{2}$

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