factor completely 3x^3 + 24
factor by grouping 6r^2 -2r -3r +1
factor by grouping 6r^2 -2r -3r +1
-
3x^3 + 24 = 3 (x^3+8) = 3 (x+2)(x^2-x+4)
6r^2 -2r -3r +1 = 3r (2r - 1) - (2r -1 )=(3r-1)(2r-1)
6r^2 -2r -3r +1 = 3r (2r - 1) - (2r -1 )=(3r-1)(2r-1)