- #1
Sheneron
- 360
- 0
Homework Statement
[tex]x^3 + 3x^2 - 16x - 48 <= 0[/tex]
factored it down to get this.
[tex](x+3)(x^2 -16) <= 0[/tex]
[tex]x + 3 <= 0[/tex]
[tex]x <= -3[/tex]
[tex]x^2 - 16 <= 0[/tex]
[tex]x <= 4[/tex]
[tex]x <= -4[/tex]
But, that is not right, looking at a graph x needs to be greater than or equal to -3, not less than or equal to. But the other one is right. How come?