[b]Define a quadratic function[/b]:[br]f(x) := x^2 - 4[br][br][br][br][b]Solve an inequality[/b]:[br]Solve[$1 < 0, x][br][br][br][br][b]Now solve with this command[/b]:[br]Solve[#1 < 0, x][br][br][br][br][b]Change line 1 to[/b]:[br]f(x) := x^2 - 9
[b]Observe:[/b] [br]What happens to the lines using $1 and #1?
When would a teacher want a static result? [br]When might dynamic be more helpful?[br]