Book Maths Puzzle Algebra

Please Help....solve using the quadratic formula...-x^2 -3x+5=0

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Book Other Question

Two trains, one 500 meters long and the other 1000 meters long, are traveling in opposite directions on parallel tracks. The first train is traveling at 100km/h and the other at 80km/h. How long will it take for the trains to pass each other from the moment the locomotives are at the same point? What is the single logarithm of ln 5 +2ln x-3ln(x2+1)?

What is the single logarithm of 2log5x+3log5y-4log5z