Question

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

Answer 1

$x^3+3x^2-x-3$

$x^2(x+3)-x-3$

$x^2(x+3)-(x+3)$

$\boxed{\boxed{(x+3)(x^2-1)}}$

Answer 2

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