Edge alg 2 answers anyone?

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Find the roots of the equation below. x^2 - 6 + 9 = 0

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?