## vertex

### In mathematics, a vertex is a point where two or more lines, curves, or edges intersect

In mathematics, a vertex is a point where two or more lines, curves, or edges intersect. It is commonly used to refer to the meeting point of edges in a geometric figure, such as the corners of a polygon or the intersection of edges in a three-dimensional shape.

For example, in a triangle, each of the three corners is a vertex. Similarly, in a cube, each of the eight corners is a vertex. In graph theory, a vertex represents a point or node in a network, and the connections between vertices are represented by edges.

In algebraic terms, a vertex can also refer to a maximum or minimum point on a curve or a parabola. In the context of a quadratic function, the vertex is the highest or lowest point on the graph, depending on whether the parabola opens upwards or downwards.

To find the vertex of a quadratic function in standard form (f(x) = ax^2 + bx + c), you can use the formula x = -b / (2a) to find the x-coordinate of the vertex, and then substitute this value back into the function to find the corresponding y-coordinate.

Overall, a vertex represents a significant point of intersection or extremum in various mathematical contexts, serving to provide valuable information about the characteristics and properties of the given shape or function.

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