What is the answer for 8b - 2b -4

The solution set for 5v2 – 125 = 0 is

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

What is the factored form of the following expressions? d^2 – 13d + 36