Merge branch 'master' of ssh://charles/tank/andrew/school/notes

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 #### Quadratics
 **Quadratics:** $x^2 + bx + c = (x+m)(x+n)$ where $mn=c$, $m+n=b$  
-**Difference of squares:** $a^2 - b=^2 = (a - b)(a + b)$  
+**Difference of squares:** $a^2 - b^2 = (a - b)(a + b)$  
 **Perfect squares:** $a^2 \pm 2ab + b^2 = (a \pm b^2)$  
 **Completing the square (monic):** $x^2+bx+c=(x+{b\over2})^2+c-{b^2\over4}$  
 **Completing the square (non-monic):** $ax^2+bx+c=a(x-{b\over2a})^2+c-{b^2\over4a}$