book Maths Puzzle Numerical Ability

how do you graph -5root(x) isbn 0-395-93778-7 chapter 7.5

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A bicyclist took a ride to the country and it took 5 hours. To get back she went 5mph faster and it took 4 hours. What were the speeds, going and coming? p(x)=36x^4-108x^3+245x^2-432x+404 has four complex roots. One of them is x=2i 0 - 2i. The other conjugate complex pair of roots is ____ +- _____i.