- #1
Corkery
- 32
- 0
Homework Statement
6x^3 - 3x^2 - 45x
Homework Equations
The Attempt at a Solution
-first factor out 3x
3x(2x^2 - x -15)
2 x 5 = 30 so...
3x(2x^2 + 5x - 6x - 15)
-separate the equations
3x(2x^2 + 5x)( - 6x -15)
-simplify a few things.
3x^2(2x + 5) -3 (2x + 5)
(3x^2 - 3)(2x + 5)
set both equations to zero
2x + 5 = 0
2x = -5
x = -5/2
3x^2 - 3 = 0
3x^2 = 3
thats where I get stuck, that is if I did this right. thanks for any help you can offer.