Quiz about Unit 6 Radicals and Imaginary Numbers

Question 1

(2i)2

Accepted Answer

Real

Answer

Imaginary

Question 2

2i(4i)

Accepted Answer

Real

Answer

Imaginary

Question 3

r² - 6r - 51 = 4

Accepted Answer

11, -5

Answer

-11, 5

Answer

6, -9

Answer

0, 51

Question 4

9x² -25x +25 = 5x

Accepted Answer

5/3

Answer

2

Answer

3/2

Answer

4/3

Question 5

10r² - 9r -8 = -10

Accepted Answer

2 real solutions

Answer

No real solutions,

2 imaginary solutions

Answer

One real solution

Answer

One real solution,

One imaginary solution

Question 6

-9a² - 4 = -5a

Accepted Answer

No real solutions,

2 imaginary solutions

Answer

2 real solutions

Answer

One real solution

Answer

One real solution,

One imaginary solution

Question 7

8b² + 8b = -2

Accepted Answer

One real solution

Answer

Two imaginary solutions

Answer

Two real solutions

Answer

One real solution

One imaginary solution

Question 8

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

Accepted Answer

-3i + 1

Answer

-5i + 1

Answer

-i + 3

Answer

i - 3

Question 9

Select ALL products that are real numbers

Accepted Answer

-2i * i

Answer

-3 * i

Answer

5*i

Answer

i2 * i

Question 10

Select ALL products that are real numbers

Accepted Answer

(-3)(-4)

Accepted Answer

5 * -4

Accepted Answer

i2 * -4

Answer

-2i * -4

Question 11

Which of the following quadratic functions, when graphed, would NOT cross the x-axis?

Accepted Answer

y = 4x² - 4x + 5

Answer

y = 2x² + 5x - 3

Answer

y = -x² - x + 6

Answer

y = 3x² - 13x + 4

Question 12

What are the solutions to the equation

x² - 4x + 20 = 0

Accepted Answer

2 + 4i and 2 - 4i

Answer

6 and -2

Answer

4 + 8i and 4 - 8i

Answer

-2 + 4i and -2 - 4i

Unit 6 Radicals and Imaginary Numbers

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