Quadratic equations

Solve x2 - 5x + 6 = 0.

• 1 x = 2 or 3
• 2 x = 1 or 6
• 3 x = 5 or 1
• 4 x = -2 or -3

The roots of x2 = 16 are:

• 1 4 and -4
• 2 -4 only
• 3 8
• 4 4 only

The quadratic formula gives x equal to:

• 1 (b plus or minus 2ac) / 4
• 2 -b / 2a only
• 3 (-b plus or minus the square root of (b2 - 4ac)) / 2a
• 4 (-b plus or minus the square root of (b2 + 4ac)) / a

Solve x2 + 2x - 8 = 0.

• 1 x = 1 or -8
• 2 x = 2 or -4
• 3 x = -2 or 4
• 4 x = 8 or -1

Which of these is a quadratic equation?

• 1 x2 + 2x + 1 = 0
• 2 2x + 3 = 0
• 3 1/x = 2
• 4 x3 = 8

Solve 2x2 - 8 = 0.

• 1 x = 4
• 2 x = 8
• 3 x = 2 or -2
• 4 x = 0