Find the maximum number of positive and negative REAL zeros.

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1. Find the maximum number of positive and negative real zeros for this equation:

y = x³ - x² - x - 1

2. Find the maximum number of positive and negative real zeros for this equation:

y = 2x^4 - 7x³ + 9x² -3x - 7

3. Find the maximum number of positive and negative real zeros for this equation:

y = x^5 - 68x^4 + 1085x³ + 2450x² - 51

4. Find the maximum number of positive and negative real zeros for this equation:

y = 2x³ + x - 3

5. Find the maximum number of positive and negative real zeros for this equation:

y = x² -5x - 3

6. Find the maximum number of positive and negative real zeros for this equation:

y = - x³ - 2x² - 2x - 5

7. Find the maximum number of positive and negative real zeros for this equation:

y = 3x³ - x² + 27x - 9

8. Find the maximum number of positive and negative real zeros for this equation:

y = x³ + 3x² - 3x - 9

9. Find the maximum number of positive and negative real zeros for this equation:

y = x³ - 6x² + 7x + 4

10. Find the maximum number of positive and negative real zeros for this equation:

y = - 2x³ - x² - 9x + 9

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