How do you factor #x^3+3x^2-x-3#?
1 Answer
Jan 22, 2016
(x + 3 )(x + 1 )(x - 1 )
Explanation:
Factorise by grouping.
ie
# [ x^3 + 3x^2 ] + [ - x - 3 ]#
# = x^2 (x + 3 ) - 1(x + 3 )# [common factor of ( x + 3 ) ]
# = (x + 3 ) (x^2 - 1 )#
# (x^2 - 1 ) =(x + 1 )(x - 1 ) color(black)(" difference of 2 squares ")#
