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

Solve x² - 7x + 10 = 0.

• 1 x = 1 or 10
• 2 x = 2 or 5
• 3 x = 7 or 3
• 4 x = -2 or -5

Solve x² + 4x + 3 = 0.

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

The standard form of a quadratic equation is:

• 1 ax² + bx + c = 0
• 2 a/x = b
• 3 ax³ + b = 0
• 4 ax + b = 0

Solve x² = 2x.

• 1 x = 2 only
• 2 x = 4
• 3 x = 0 or 2
• 4 x = 0 only