Basic quadratic equations and the discriminant

Solve for x: x² = 16

• x = ±4

• x = ± 16

• x = ± 3

• None of these

The discriminant formula is

• y = mx + b

• -b

  (2a)

• a² + b² = c²

• b² - 4ac

Solve for x:

(x + 2)² = 9

• x = 1 and x = 5

• x = 1 and x = -5

• x = -1 and x = 5

• None of these

What is the discriminant of: 2x² - 3x + 1

• 17

• -11

• 1

• None of these

Solve for x:

x² = -9

• ± 3

• ±9i

• ±4i

• ± 3i

What are the roots?

• There are no real roots

• (0, -3) and (0, -1)

• (3, 0) and (1, 0)

• (-3, 0) and (-1, 0)

How many real roots are there for 2x² - x + 2 = 0?

• 0

• 1

• 2

• 3

How many real roots are there for x² + 3x + 1 = 0?

• 0

• 1

• 2

• 3

How many real roots are there for 5x² + 1?

• 0

• 1

• 2

• 3

What is the discriminant for 5x² + 1 = 0

• 15

• -20

• 25

• -15