Learn how to write the equation of a parabola given the vertex through a point

The video tutorial explains the vertex and standard forms of parabolas, focusing on how to write the equation of a parabola given a vertex and a point. It emphasizes using the vertex form when the vertex is known, and demonstrates solving for the variable 'a'. The tutorial also covers the final equation and discusses the graph's behavior, including vertical compression and horizontal stretch.

What is the primary advantage of using the vertex form of a parabola equation when given a vertex?

• It allows for easy calculation of the y-intercept.

• It makes it easier to calculate the roots.

• It directly provides the vertex coordinates.

• It simplifies finding the axis of symmetry.

In the vertex form equation y = a(x - h)^2 + k, what do the variables h and k represent?

• The coefficients of x and y.

• The x-intercept and y-intercept.

• The vertex coordinates.

• The axis of symmetry and the focus.

When solving for 'a' in the vertex form, which step is crucial after substituting the known values?

• Calculating the discriminant.

• Simplifying the equation.

• Identifying the axis of symmetry.

• Finding the y-intercept.

What does a value of 'a' less than one indicate about the parabola's graph?

• The parabola has no vertex.

• The parabola opens downwards.

• The parabola is a vertical compression.

• The parabola is a vertical stretch.

If 'a' is positive in the vertex form of a parabola, what can be inferred about the parabola's orientation?

• The parabola is a horizontal stretch.

• The parabola opens downwards.

• The parabola opens upwards.

• The parabola is a vertical stretch.