I'm kind of stuck. What do I do now?
-5t2 + 125t - 375 = 0
5t2 - 125t + 375 = 0
t2 - 25t + 75 = 0
Use the quadratic equation to get the two values of t:
\(t = {-(-25) \pm \sqrt{(-25)^2-4\times 75} \over 2}\)
I'll leave you to crunch the numbers.
Edited to replace x by t.
I'm not quite sure we've had this ? This looks overly complicated.
It's the standard formula for solving quadratic equations (though I should have written "t = ..." not "x = ..."), which is often necessary when the quadratic equation doesn't factor nicely (as yours doesn't).
