Figure 1:

1, solve the equation x? =4 x=-2 or 2

∴k=-2×2=-4

2、①m？ +2m≠0 and m? +m- 1= 1

The solution is m= 1.

②m？ +2m≠0 and m? +m- 1=- 1

The solution is m=- 1.

Figure 2:

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