Hickory is a kind of tree, found in North America. Hickory wood is popular in for example tools, since it is fairly strong in comparison to its weight.
... \frac{b}{a} \right) x + \frac{c}{a}=0
</math>
which is equivalent to
<math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math>
The equation is now in a form in ...