Answer:
<h2>u = 0</h2>
Step-by-step explanation:

Plot the points you found in part (b) on a suitable set of coordinates and draw a line through them. It might help your accuracy to use the y-intercept of 20 also.
Answer:(x+3) 2−7
Step-by-step explanation:
If you would have to graph x=7, you probably know that this is a vertical line at, well, x=7.
| x | = 7 is nothing more than two vertical lines, namely x=7 or x=-7, as you already wrote down.
| x | = -8 has no (real) solutions, so there is nothing to graph.
Try looking at this and see if it helps http://openstudy.com/updates/580662f4e4b0d88e39fc9a0e