Understanding and using complex number notation

 $\sqrt{-9}=$  

•  $-3$  

•  $3i$  

•  $\pm3$  

•  $-3i$  

Simplify: √-49

• 7
• 7i
• -7i
• -7

√-4

• -2

• -2i

• 2

• 2i

Is it possible to take the square root of a negative number?

• Yes

• No

Simplify the expression.

 $\sqrt{\frac{-9}{144}}$  

•  $\frac{3}{12}$  

•  $-\frac{1}{4}$  

•  $\frac{i}{4}$  

•  $\frac{i}{12}$  

• repeating

• terminating

• irrational

• can't be done

• repeating

• terminating

• irrational

• can't be done

Solve using the square root property:

 $x^2\ +100=0$  

•  $x\ =\ \left\{10i\right\}$  

•  $x\ =\ \left\{\pm10i\right\}$  

•  $x\ =\ \left\{\pm i\ \sqrt{100}\right\}$  

•  $x\ =\ \left\{\pm2i\sqrt{50}\right\}$  

√-9

• -3i
• 3
• 3i
• -3