The Quadratic Formula

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x - 4 = 0 for x?

Using the quadratic formula to solve 7x2 - x = 7, what are the values of x?

Which equation has the solutions ?

Which equation has the solutions ?

What is the discriminant of 9x2 + 2 = 10x?

If x = -3 is the only x-intercept of the graph of a quadratic equation, which statement best describes the discriminant of the equation?

What is the discriminant of ?