Quadratic Formula

Identify a, b and c in the quadratic equation: $2x^2-3x-5=0$   

• a = 2 , b = 3, c = -5

• a = 2, b = -3, c = 5

• a = 2, b = -3, c = -5

• a = -2, b = 3, c = 5

 $b^2-4ac$  is called the . . .

• Square root

• Quadratic formula

• X-intercepts

• Discriminant 

Solutions of a quadratic equation are also called

• roots

• x-intercepts

• zeros

• All of the above

If there are no real solutions, the discriminant is

• zero

• a postive number

• a negative number

• a perfect square

The first step in solving quadratic equations is to . . .

• factor

• write the equation in standard form

• use quadratic formula

• complete the square

If there is one solution, the discriminant is . . .

• zero

• a postive number

• a negative number

• a perfect square

 $2x^2-36=x$  

•  $x=\frac{-9}{2}and\ 4$  

•  $x=\frac{9}{2}\ and\ -4$  

•  $x=4\ and\ -4$  

• No real solution

 $w^2+7w+4=0$  

•  $\frac{-7\pm\sqrt{33}}{2}$  

•  $\frac{-7\pm\sqrt{65}}{2}$  

•  $\frac{7\pm\sqrt{33}}{2}$  

•  $\frac{-7\pm3\sqrt{11}}{2}$  

 $2y^2+2=9y$  

•  $\frac{-9\pm\sqrt{65}}{2}$  

•  $\frac{9\pm5\sqrt{13}}{4}$  

•  $\frac{9\pm\sqrt{65}}{4}$  

•  $\frac{-9\pm\sqrt{-97}}{4}$  

 $x^2-6x+4=0$  

•  $3\pm\sqrt{5}$  

•  $\frac{6\pm\sqrt{20}}{2}$  

•  $3\pm\sqrt{20}$  

•  $3\pm i\sqrt{13}$