Example 5: Using the quadratic formula | Quadratic equations | Algebra I | Khan Academy

Which of the following represents the quadratic formula for solving ax^2 + bx + c = 0?

• x = [-b ± sqrt(b^2 + 4ac)] / 2a

• x = [b ± sqrt(b^2 - 4ac)] / 2a

• x = [-b ± sqrt(b^2 - 4ac)] / 2a

• x = [-b ± sqrt(4ac - b^2)] / 2a

For the quadratic equation -3x^2 + 10x - 3 = 0, what are the values of a, b, and c?

• a = 3, b = 10, c = 3

• a = -3, b = 10, c = -3

• a = -3, b = -10, c = -3

• a = 3, b = -10, c = 3

What is the value of the discriminant (b^2 - 4ac) for the equation -3x^2 + 10x - 3 = 0?

• 136

• 64

• -64

• 100

What are the solutions for x in the quadratic equation -3x^2 + 10x - 3 = 0?

• x = 1/3, x = -3

• x = -1/3, x = 3

• x = 1/3, x = 3

• x = -1/3, x = -3