What's is factorazation​

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

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno nina made two errors in the proof. identify and correct the errors.