FACTORISATION
2y3 – 5y² – 19y+ 42
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2y3-5y²-19y+42=?
=2y3-5y²-19y = -42
=2y-5y²-19y= -42/3
=2y-5y²-19y = -14
=y-5y²-19y= -14/2
=y-5y²-19y= -7
=1y-19y-5y²= -7
= 18y-5y²= -7
=y-5y²= -7/18
=y-5y= root over 2 -7/18
=4y= -7/9
=y= -7/9 ×4
=y= -28/9
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