Is the supposed to be a image
To find median you set up the number least to greasiest and then cross each one out one side at a time until you get to the middle
5(x^2 - 14x + 258/5)
= 5((x-7)^2 -49+258/5)
= 5((x-7)^2 + 13/5)
= 5(x-7)^2 + 13
I belive this is how it should be done