Theory of quadratic equations

The discriminant of ax2 + bx + c = 0 is:

• 1 -b / 2a
• 2 4ac
• 3 b2 + 4ac
• 4 b2 - 4ac

If the discriminant is negative, the roots are:

• 1 Complex
• 2 Real and distinct
• 3 Rational
• 4 Real and equal

The sum of the roots of x2 - 7x + 12 = 0 is:

• 1 -7
• 2 -12
• 3 7
• 4 12

The product of the roots of x2 - 7x + 12 = 0 is:

• 1 -12
• 2 7
• 3 -7
• 4 12

The discriminant of x2 - 4x + 4 = 0 is:

• 1 4
• 2 16
• 3 -4
• 4 0