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The function p(x) is a polynomial. If p(–9)=–10 and p(–2)=–7, can you conclude that p(x) is ever equal to 0?

Question

The function p(x) is a polynomial. If

  • p(–9) = –10
  • p(–2) = –7

can you conclude that p(x) is ever equal to 0 ?

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Solution

To determine whether the polynomial function p(x) p(x) is ever equal to 0 given the values p(9)=10 p(-9) = -10 and p(2)=7 p(-2) = -7 , we can analyze the implications of these values.

1. Analyze Provided Values

We know:

  • p(9)=10 p(-9) = -10
  • p(2)=7 p(-2) = -7

Both results are negative.

2. Continuous Nature of Polynomials

Polynomials are continuous functions, meaning that they do not have gaps or jumps in their values. If a polynomial takes a negative value at two different points, it's possible that it could cross the x-axis (where p(x)=0 p(x) = 0 ) depending on the nature of the polynomial.

3. Intermediate Value Theorem

According to the Intermediate Value Theorem, if a continuous function takes on two values of opposite sign around an interval, it must cross zero at least once in that interval. Since p(9) p(-9) and p(2) p(-2) are both negative, we conclude that there is no guarantee for a root p(x)=0 p(x) = 0 between these points.

Conclusion

Based on the information provided, we cannot conclude that p(x) p(x) is equal to 0 at any point; in fact, the values given suggest that p(x) p(x) is negative within that interval.

Final Answer

No, we cannot conclude that p(x) p(x) is ever equal to 0 given that both p(9) p(-9) and p(2) p(-2) are negative.

This problem has been solved

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