calculating x when y is > 0
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I have plotted a changing distance (d(x)) with time using cftool and calculated the function. Its derivative was calculated and this is v(x). when plotted with fplot the initial Y values are 0. I am calculating the x position at which this rises above the x axes (y>0). To do this i made v(x) equivalent to 1 (==1) and evluated x yet:
(4119*x^2)/10000 - (1787*x)/5000 + 891/2500 ==1
>> eval x
Will someone please help to calculate this? i can measure the x value directly. It is preferable to standardise this procedure.