3. and 4. Dear math student from altadena, CA: now that you've seen how to work a couple of these, why not try the next two on your own. If you run into any difficulty, send me a message and I'll help you.
5. (2x3 - 4x2 -7x +19) + ? = (x2 + 3x +24)
You can treat the question mark just as if it were some other variable.