Factor the sum of terms as a product of the gcf and a sum of 20 + 64

Find the vertex of the function given below y=x^2-6x+1

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Can you me find the missing length. i attached an image.