Find the positive and negative domains of the function below:
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Find the positive and negative domains of the function below:
The function given is .
This is a quadratic function in vertex form: where , , and . The vertex of the function is at and since , the parabola opens downwards.
Step 1: Identify intervals for negative and positive values:
- The vertex at is the maximum point of the parabola.
- For the quadratic to have positive values, must be greater than 0. Given the vertex and opening direction of the parabola, there are no values for which is positive because the parabola is entirely below the x-axis.
Step 2: Analyze values when and :
- The parabola is below the x-axis () for all . Therefore, when checking for , the function remains negative for all positive .
Conclusion: This shows that the function is not positive for any , but is negative for all .
Therefore, the positive and negative domains are as followed:
The correct answer is Choice 2.
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The graph of the function below intersects the X-axis at points A and B.
The vertex of the parabola is marked at point C.
Find all values of \( x \) where \( f\left(x\right) > 0 \).
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