Solving Quadratics with Complex Numbers

3x² = 12

• ± 2
• 2
• ± √12
• ± 4

Tags

CCSS.8.EE.A.2

-5x² = -50

• ± 5
• ± 10
• ± √10
• -10

Tags

CCSS.8.EE.A.2

x² - 4 =-68

Hint: do you remember what the square root of -1 =?

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

(x + 1) ² = 25

Remember to add the ± as soon as you take the square root of both sides, THEN move the one over to get x by itself.

• ± 5
• 4  or  -6
• -4  or  6
• ± 4

Tags

CCSS.HSA-REI.B.4B

Solve by taking square roots:
k² - 6 = 43

• k = √37
• k = 37 or - 37
• k = 7, k = -7
• no solution

Tags

CCSS.HSA-REI.B.4B

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

Hint: what do you do when you have a NEGATIVE square root?

• b = 9i, b = -9i

• b = 3i, b = -3i

• b = 9, b = -9

• b= 3, b= -3

Tags

CCSS.HSA-REI.B.4B

Write the question and show all work.
(x-5)² = 25

• ±0
• ±10
• 10, 0
• -10, 0

Tags

CCSS.HSA-REI.B.4B

Pick which equation I can use square roots to solve:

• 3x² + 2x + 1 = 0

• 3x² -27 = 0

• 3x² + 2x = 1

• 4x + 10 = 0

Tags

CCSS.HSA-REI.B.4B

What are the roots of this quadratic function?

• -4 and 0

• 4 and 0

• -2 and 4

• 0

Tags

CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4