Chapter 4 review

Simplify $\sqrt{-125}$   

• 5 $\sqrt{5}$  

• 5i $\sqrt{5}$  

• 25

• 15i

Simplify (-2-5i) - (-5 + 4i)

• -3 + 9i

• -10 - 20i²

• 3-9i

• 30

Simplify - $\sqrt{-81}$  

• -9

• 9

• 9i

• -9i

Simplify (3i)² completely

• 9i

• -9

• 9

• 9i²

Simplify (2 + 3i) ( 1 - 4i)

• 5 + 14i

• 5 -14i

• 14 + 5i

• 14-5i

Simplify (2i) (1 - 4i) (1 + i)

• 10 + 6i

• 10-6i

• 6 + 10i

• 6 - 10i

Simplify $\frac{2\ +\ 3i}{3\ -\ i}$   

• 3 + 11 i

• 10

•  $\frac{10}{3\ +\ 11i}$  

•  $\frac{3\ +\ 11i}{10}$  

Simplify $\frac{-2\ +\ i}{1\ +\ 2i}$   

• i

• 5i

• -2 + 4i

•  $\frac{-2\ +\ 4i}{4}$  

Solve using square roots 3x² - 70 = 38

• $\pm6$

• $\pm3$

• 3

• 6

Solve using square roots x² - 7 = 14 - 2x²

• $\pm\ \sqrt{7}$

• $\pm7$

• $\pm\sqrt{3}$

• $\pm3$