Help please this is college level math

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

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.

Will give brainliest immeadeately true or false: the origin woud be included in the solution set for the inequality: y< 2x-5