1.

Factorise the following: y3+y2-y-1

Answer» HOPE U LIKE my process
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= > {y}^{3} + {y}^{2} - y - 1 \\ \\ = {y}^{2} (y + 1) - 1(y + 1) \\ \\ = (y + 1)( {y}^{2} - 1) \\ \\ = (y + 1)(y - 1)(y + 1) \\ \\ = (y - 1)(y + 1) ^{2}
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