Discriminant and Quadratic Formula Practice

If the solutions of a quadratic equation are 9 and -9, what is the value of b^2 - 4ac?

• 0

• 81

• -81

• 162

Which of the following equations has no real solutions?

• x^2 - 8x - 16 = 0

• -2x^2 + 5x - 6 = 0

• -x^2 + 6x + 1 = 0

• 0

• 1

• 2

• 3

How many non-real solutions do the equations of the following quadratic curves have?

• 0

• 1

• 2

Find the value of k for which 16x^2 + 8x + k = 0 has equal roots. Which of the following is correct?

• k = 1

• k = 2

• k = 4

How many x-intercepts does the parabola have if b^2 - 4ac = -5?

• 0

• 1

• 2

• 3

For the graph labeled 'b', determine whether the discriminant b^2 - 4ac is greater than 0, less than 0, or equal to 0.

• b^2 - 4ac > 0

• b^2 - 4ac < 0

• b^2 - 4ac = 0

Use the discriminant to determine the number of solutions 4x² + 4x + 1 = 0 has?

• 0 solutions

• 1 real

• 2 that are real

• 2 of the imaginary type

For the function above, is the discriminant positive, negative, or zero?

• Positive

• Negative

• Zero

• Cannot be determined

For the function above, is the discriminant positive, negative, or zero?

• Positive

• Negative

• Zero

• Cannot be determined