Real or no real roots: discriminant sign gives the range of the parameter

1. A.
   1
2. B.
   $\frac{1}{10}$
3. C.
   $\frac{1}{100}$
4. D.
   $\frac{1}{10000}$

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1. A.
   0.1
2. B.
   0.01
3. C.
   0.001
4. D.
   0.0001

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1. A.
   $-2\sqrt{2}<k<2\sqrt{2}$
2. B.
   $k<-2\sqrt{2}$ only
3. C.
   $k>2\sqrt{2}$ only
4. D.
   $k<-2\sqrt{2}$ or $k>2\sqrt{2}$

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1. A.
   $k < -6$
2. B.
   $-6 < k < 2$
3. C.
   $2 < k < 6$
4. D.
   $k > 6$

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1. A.
   1
2. B.
   2
3. C.
   3
4. D.
   4

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