Sky

From Antonio Math blog.

I don’t remember having to learn the vertex, focus, and directrix of the parabolas or the center, vertices, foci, and eccentricity of the hyperbola. Other than that, it is ok.
Just a note to Factor the polynomial x³ - 27 without knowing the formula.

First, when x = 3, x³ - 27 = 0 , so (x - 3) is a factor if it can be factored.
By using long division, one can find the other factor.

        x2 + 3x + 9
x - 3  /x3 - 27
     -  x3 - 3x2
           3x2 - 27
        -  3x2 - 9x
               9x - 27
           -   9x - 27