Factoring x^2 + bx + c

Each of the problems below is a link. If you click on the problem, it will take you to a YouTube video of a full, step-by-step solution for the problem. You may try these problems as practice and use the videos to check your answer, or you can just watch the videos to see more worked-out example problems.

Factor x squared + 9x + 18
Factor y squared + 2y minus 8
Factor z squared minus 39z minus 40
Factor a squared minus 9a + 20
Factor b squared minus b minus 20
Factor c squared minus 6c minus 72
Factor d squared + 21d + 54
Factor 2x squared + 20x + 48
Factor 3x to the fourth + 3x cubed minus 18x squared
Factor x squared + 4x + 6