Solving Quadratics with Square Roots Method and Imaginary Numbers

Solve using the square roots method.

Write all answers in simplest form.

Check all that apply.

x² + 81 = 0

• x = ±9i

• x = -9

• x = ±9

• No Real Solution

Solve using the square roots method. Write all answers in simplest form: 4x² + 15 = −9

• x = ±6i

• x = ±6

Solve using the square roots method. Write all answers in simplest form. x² + 13 = 1

Solve the equation using the square roots method:

81x² + 5 = 21

What is the value of x?

• x = 2

• x = -2

• x = 1

• x = -1

x² + 4 = 68

• ± 8

• ± √8

• 8

• ± 64

Solve by taking square roots:
k² - 6 = 43

• k = √37

• k = 37 or - 37

• k = 7, k = -7

• no solution

Solve by taking square roots:
5b² - 4 = 41

• b = 9, b = -9

• b = 3, b = -3

• b = 8, b = -8

• no solution

Solve using square roots.

• ± 1/4

• ± 9/36

• ± 1/2

• No real solution

Choose the best method to solve this quadratic:

​ (a)  

2(x + 2)² - 5 = 8

• Square Roots

• Quadratic Formula

• ZPP

Which method of solving quadratics would you use to solve the following:

• Completing the Square

• ZPP

• Square Roots