If the parabola is smiling and its vertex is above the x-axis, then it is always negative.
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If the parabola is smiling and its vertex is above the x-axis, then it is always negative.
To solve this problem, we'll analyze what is implied if the parabola is smiling (opening upwards) and if its vertex is located above the x-axis:
Therefore, the given statement is Incorrect.
Incorrect
The graph of the function below does not intersect the \( x \)-axis.
The parabola's vertex is marked A.
Find all values of \( x \) where
\( f\left(x\right) > 0 \).
A smiling parabola opens upward, like a U-shape. This happens when the coefficient of is positive. The vertex is the lowest point on the graph.
When the vertex is above the x-axis, the minimum value of the parabola is positive. Since an upward-opening parabola only gets higher from its vertex, all function values are positive.
Yes! If the vertex is below the x-axis, parts of the parabola will be negative. But if the vertex is above the x-axis, the entire parabola stays positive.
Set the function equal to zero: . If the vertex is above the x-axis for an upward parabola, there are no real solutions - it never crosses!
Vertex form is where (h,k) is the vertex. Standard form is . Vertex form makes it easier to see the vertex location!
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