With this! will give brainliest if the answer is right!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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 =

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?