Please help due soon

Me with this one question, and i'll upvote the brainliest answer

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

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