Illustrative Math Algebra Quadratics

What is the general form of a quadratic function?

• f(x) = a + bx + c

• f(x) = ax^2 + b

• f(x) = ax^2 + bx + c

• f(x) = ax^3 + bx + c

How can you determine the vertex of a quadratic function from its standard form?

• Use the formula x = -b / (2a) to find the x-coordinate of the vertex, then substitute it back into the function to find the y-coordinate.

• Substitute random values for x and y

• Take the square root of the coefficient of x

• Divide the coefficient of x by the constant term

How do you find the x-intercepts of a quadratic function?

• Divide the y-intercept by the slope of the function.

• Substitute the x-value of the vertex into the function.

• Set the quadratic function equal to zero and solve for x.

• Find the vertex of the parabola.

How can you determine the direction of opening of a parabola based on the coefficient of x^2 in a quadratic function?

• The direction of opening is determined by the coefficient of x^3

• The direction of opening is always upwards regardless of the coefficient of x^2

• The direction of opening is determined by the constant term in the quadratic function

• The direction of opening of a parabola can be determined based on whether the coefficient of x^2 is positive or negative.

Which answer choice describes  y = -3x² +7x - 2 accurately?

• opens up with a maximum

• opens up with a minimum

• opens down with a maximum

• opens down with a minimum 

• 1

• 3

• 2

• 5

• 4

Which of the following represents a quadratic function?

Explain how to graph a quadratic function in vertex form.

• When graphing a quadratic function in vertex form, the axis of symmetry is not relevant.

• Graphing a quadratic function in vertex form involves plotting the vertex, finding additional points using symmetry, and connecting the points to form a parabola.

• To graph a quadratic function in vertex form, you only need to plot the vertex and draw a straight line.

• Graphing a quadratic function in vertex form involves plotting the y-intercept and connecting the points to form a parabola.

What is the axis of symmetry of a quadratic function?

• x = -b / (2a) * 2

• x = -b / (2a) + 1

• x = -b / (2a)

• x = -b / (2a) - 1

Provide an example of an application of quadratic functions in real life.

• Applying exponential functions to population growth

• Using quadratic functions to calculate the area of a circle

• Modeling linear relationships between two variables

• Designing a parabolic reflector for satellite dishes