Question 197841
<font face="Garamond" size="+2">

The ground is zero meters above the ground, so you want to know the value of *[tex \LARGE x] when *[tex \LARGE y = 0].  Hence:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ -x^2 + 2x + 3 = 0]


Just solve the quadratic for *[tex \LARGE x].


John
*[tex \LARGE e^{i\pi} + 1 = 0]
</font>