a.

$$k<0$$ ou $$k>4$$

b.

$$-4<k<4$$

c.

$$k<\sqrt{8}$$ ou $$k>-\sqrt{8}$$

d.

$$k<-2 \sqrt{2}$$ ou $$k>2 \sqrt{2}$$

e.

$$-4<k<-2 \sqrt{2}$$

Answer sheet:

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