3(2x - 1)(x - 2)
3x2 + 15x + 6 = 3*(x2 + 5x + 2). There are no further rational factors.
3(x + 4)(x + 1)
-15x2+5x=-5x(3x-1)
5x(3x + 1)
3x
15x squared plus eleven
9x squared-15x squared = -6
You can't factor it
3x3+15x2+18x = 3x(x2+5x+6) = 3x(x+2)(x+3)
-15x=-5*3x+2 -15x=-15x+2 +15x +15x ----------------- 0=2
x + 10
x + 5