Quadratic equations

The roots of x² - 3x + 2 = 0 are:

• 1 3 and 2
• 2 1 and 2
• 3 -1 and -2
• 4 1 and -2

If the roots of a quadratic are real and equal, the discriminant is:

• 1 Negative
• 2 Zero
• 3 Positive
• 4 Undefined

If a and b are roots of x² - 5x + 6 = 0, then a + b equals:

• 1 -6
• 2 5
• 3 6
• 4 -5

A quadratic with roots 2 and 3 is:

• 1 x² - x + 6 = 0
• 2 x² - 5x + 6 = 0
• 3 x² - 6x + 5 = 0
• 4 x² + 5x + 6 = 0

The cube roots of unity are 1, w and w². The value of 1 + w + w² is:

• 1 -1
• 2 0
• 3 3
• 4 1

Solve x² - 4x + 4 = 0.

• 1 x = 2 (repeated)
• 2 x = 4
• 3 x = 2 or -2
• 4 x = -2

If one root of x² - 5x + 6 = 0 is 2, the other is:

• 1 3
• 2 -3
• 3 4
• 4 -2

The complex cube roots of unity are:

• 1 i and -i
• 2 1 and -1
• 3 2 and 3
• 4 w and w²