Given the expression of the quadratic function
Finding the symmetry point of the function
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Given the expression of the quadratic function
Finding the symmetry point of the function
To determine the symmetry (vertex) point of the quadratic function , we will use the formula for the x-coordinate of the vertex (or axis of symmetry) for a general quadratic function , which is given by:
In this problem, the coefficients are , , and . By substituting these values into the vertex formula:
This tells us that the x-coordinate of the vertex is . To find the y-coordinate of the vertex, we substitute back into the function :
Thus, the vertex of the function, also its symmetry point, is at the coordinate .
Therefore, the symmetry point of the function is .
Given the expression of the quadratic function
Finding the symmetry point of the function
\( f(x)=-5x^2+10 \)
Since has no linear term (b = 0), the parabola is perfectly centered on the y-axis. The vertex formula gives x = 0, and f(0) = 0.
The coefficient makes the parabola wider than y = x². It doesn't change the vertex location, just the shape - smaller coefficients create wider parabolas.
Think "negative b over 2a" for the x-coordinate: . Then substitute this x-value back into the function to find the y-coordinate.
A constant term shifts the parabola up or down but doesn't change the x-coordinate of the vertex. So would have vertex at (0,3).
Only when a > 0 (parabola opens upward). Since here, the vertex (0,0) is indeed the minimum point of this function.
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