Quadratic Formula and Complex Numbers

 $2x^2+9x+4=0$  Find the a, b, and c.

• a=2, b=9, c=4

• a=4, b=9, c=4

• a=4, b=-9, c=4

• a=2, b=-9, c=4

Use the quadratic formula to solve.  $2x^2+9x+4=0$  

•  $x=-\frac{1}{2},\ x=-4$  

•  $x=\frac{1}{2},\ x=4$  

•  $x=-2,\ x=-4$  

•  $x=2,\ x=4$  

Find the a, b, and c:  $x^2-3x-3=0$  

• a=1, b=-3, c=-3

• a=0, b=3, c=-3

• a=0, b=-3, c=-3

• a=1, b=3, c=-3

Solve using the quadratic formula:  $x^2-3x-3=0$  

• x = 3.79 and x = -0.79

• x = -3.79 and x = 0.79

• x = 2.49 and x = -0.59

• x = -2.49 and x = 0.59

Find the a, b, and c:  $9x^2-4x+2=0$  

• a = 9, b = -4, c = 2

• a = 81, b = -4, c = 2

• a = 81, b = 4, c = 2

• a = 9, b = 4, c = 2

Find the solution using the quadratic formula:  $9x^2-4x+2=0$  

•  $x=0.222\pm0.415i$  

•  $x=0.111\pm0.323i$  

•  $x=0.333\pm0.671i$  

•  $x=0.444\pm0.216i$  

 $3i+2i$  

•  $5i$  

•  $5i^2$  

•  $-5$  

•  $i$  

 $\left(4-3i\right)+\left(2+2i\right)=$  

•  $6-i$  

•  $6-5i$  

•  $6-3i^2$  

•  $9$  

 $4i-7i=$  

•  $-3i$  

•  $11i$  

•  $-3i^2$  

•  $3$  

 $\left(3+2i\right)-\left(2-i\right)$  

•  $5+3i$  

•  $1+3i$  

•  $1+i$  

•  $5+i$