Coll Math 4.6-4.7 quiz review

√-72

• 6i√2

• -6√2

• 3i√8

• -3√8

√-6 ⋅ √-8

• -4√3

• 4i√3

• i² 4√3

• 4√3

(4 - 8i) - (18 - 3i)

• -14 - 5i

• -14 - 11i

• 22 - 11i

• 22 - 5i

(3 - 4i)(2 + 5i)

• 26 + 7i

• 6 - 13i

• -14 + 7i

• 26 + 23i

 $\frac{4\ +\ i}{2-3i}$  

•  $\frac{5}{13}\ +\ \frac{14i}{13}$  

•  $\frac{8}{13}+\ \frac{17i}{13}$  

•  $\frac{11}{5}-\frac{10i}{5}$  

•  $\frac{11}{13}-\frac{10i}{13}$  

4x² + 4 = -12x² - 5

• $\pm\frac{3}{4}$

• $\pm\frac{3i}{4}$

• $\frac{3i}{4}$

• $\frac{-3i}{4}$

Solve using the Square Root Property

9x² + 6x + 1 = 27

• $\frac{-1\pm3\sqrt{3}}{3}$

• $\frac{1\pm3\sqrt{3}}{3}$

• -3 ± 3√3

• 3 ± 3√3

Find the value of c that makes the expression a perfect square trinomial. Then write the expression as a perfect square.

x² + 9x + c

• $\frac{81}{4}$ ; $\left(x\ +\frac{9}{2}\right)^2$

• 81; $\left(x+9\right)^2$

• 81; $\left(x+\frac{9}{2}\right)^2$

• $\frac{81}{4}$ ; $\left(x+9\right)^2$

Solve by completing the square.

4x² + 16x = -32

• -2 ± 2i

• 2 ± 2i

• -8 ± 4√2

• 8 ± 4√2

Solve by completing the square.

3x² + 18x - 42 = 0

• -3 ± √23

• -3 ± i√23

• 3 ± √14

• -3 ±√14