## High School Math Skills

Posted by sky | Tags: Math, exercise

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 x^{3} - 27 without knowing the formula.

First, when x = 3, x^{3} - 27 = 0 , so (x - 3) is a factor if it can be factored.

By using long division, one can find the other factor.

__x__^{2} + 3x + 9

x - 3 /x^{3} - 27

- __x__^{3} - 3x^{2}

3x^{2} - 27

- __3x__^{2} - 9x

9x - 27

- __9x - 27__

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