About Quadratic Formula:

We previously learned how to solve any quadratic equation using the method known as: completing the square. We can use this process to create a general formula for solving any quadratic equation. This formula is known as the "Quadratic Formula".


Test Objectives
  • Demonstrate the ability to write a quadratic equation in standard form
  • Demonstrate the ability to identify a, b, and c in a quadratic equation
  • Demonstrate the ability to solve a quadratic equation using the quadratic formula
Quadratic Formula Practice Test:

#1:

Instructions: Solve each equation using the quadratic formula.

a) $$2x^2 + 11x + 12 = 0$$


#2:

Instructions: Solve each equation using the quadratic formula.

a) $$6n^2 - 10n + 7 = 0$$


#3:

Instructions: Solve each equation using the quadratic formula.

a) $$-10x^2 + 6 = 0$$


#4:

Instructions: Solve each equation using the quadratic formula.

a) $$7x^2 = -11 + 10x + 5x^2$$


#5:

Instructions: Solve each equation using the quadratic formula.

a) $$-p^2 - 10p - 25 = 0$$


Written Solutions:

#1:

Solutions:

a) $$x = -\frac{3}{2}$$ or $$x = -4$$


#2:

Solutions:

a) no real solution


#3:

Solutions:

a) $$x = \frac{\pm\sqrt{15}}{5}$$


#4:

Solutions:

a) $$x = \frac{5 \pm \sqrt{3}}{2}$$


#5:

Solutions:

a) $$p = -5$$