Question

factorize
$y3 + y {}^{2} - y - 1$
​

Answer 1

$\: \: \: \: {y}^{3} + {y}^{2} - y - 1 \\ \\ = {y}^{2} (y + 1) - 1(y + 1) \\ \\ = ( {y}^{2} - 1)(y + 1) \\ \\ = (y + 1)(y + 1)(y - 1)$