Concepts in complex numbers

the square root √-25 is..

• 5
• -5
• 8
• impossible/not real

Solve for x: 2x^2 + 15 = 7.

• ± 5i

• ± 4i

• ± 3i

• ± 2i

Select ALL of the square roots of -36.

• 6

• -6

• 18

• -18

• No real roots

Express  $\sqrt{-225}$  in terms of  $i$  

•  $15i$  

•  $-15i$  

•  $i\sqrt{15}$  

•  $-i\sqrt{15}$  

 $Simplify:\ \sqrt{-500}$  

•  $-250$  

•  $5i\sqrt{10}$  

•  $10i\sqrt{5}$  

•  $50i$  

Find the square root(s) of

 $-\sqrt{1}$  

• imaginary (i)

• undefined

• -1

• 1

Simplify.

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