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4.6 Practice B (evens): Write the expression
as a complex number in standard form.
1.)
Algebra II
4.8: Quadratic Formula
Quadratic Formula
 The
quadratic formula is used to solve any
quadratic equation.
 Quadratic
then
Formula: If ax2 + bx + c = 0,
Discriminant
 The
 The
discriminant = b2 – 4ac
value of the discriminant tells you how
many solutions the quadratic equation has.
 0  1 real solution.
 positive number  2 real solutions.
 negative number  2 imaginary
solutions.
Find the discriminant and
determine the number of solutions.
1.) x – 8x + 16 = 0
2
2
2.) 5x + 20x = -21
Use the Quadratic Formula to find
the solutions to the equation.
1.) x2 – 4x – 5 = 0
Use the Quadratic Formula to find
the solutions to the equation.
2.) 3 – 8v – 5v = 2v
2
Use the Quadratic Formula to find
the solutions to the equation.
3.) 4x2 + 3 = x2 – 7x