faoctorise ...--
plss.. answer ...
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3y^3 +y^2 - 3y - 1
=> 3y^3 - 3y + y^2 - 1
=> 3y(y^2 - 1) + 1(y^2 - 1)
=> (3y + 1) ( y^2-1)
=> (3y + 1) ( y+1) (y-1)
=> 3y^3 - 3y + y^2 - 1
=> 3y(y^2 - 1) + 1(y^2 - 1)
=> (3y + 1) ( y^2-1)
=> (3y + 1) ( y+1) (y-1)
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