angeltovar angeltovar

13-12-2013
Mathematics

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what is x3+3x2-x-3 factor by grouping

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tomek1172 tomek1172

13-12-2013

x3 + 3x2-x-3=0
x2(x+3)-(x+3)=0
(x2-1)(x+3)=0
x2-1=0
(x-1)(x+1)=0
x=1
x=-1

x+3=0
x=-3

Answer Link

13-12-2013

[tex]x^3+3x^2-x-3[/tex]

[tex]x^2(x+3)-x-3[/tex]

[tex]x^2(x+3)-(x+3)[/tex]

[tex]\boxed{\boxed{(x+3)(x^2-1)}}[/tex]

Answer Link

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