Solving Quadratics with Negative Square Roots

x² = 16

• ± 4

• ± 8

• 4

• 8

Tags

CCSS.8.EE.A.2

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

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

Solve

2y² - 5 = 93

Be careful, work from the outside in, get the squared term by itself, THEN take the square root.

• y = 7

• y = ±7

• y = 24.5

• y = ±24.5

Tags

CCSS.8.EE.A.2

• 10
• -10
• 10i
• -10i

• A
• B
• C
• D

Tags

CCSS.8.EE.A.2

If there are no real solutions, the discriminant is

• zero

• a postive number

• a negative number

• a perfect square

Tags

CCSS.HSA-REI.B.4B

What has to be done first here to begin to solve?

• make the equation = 0

• combine 11x and 28

• list factors of -28

• list factors of 11

Tags

CCSS.HSA-REI.B.4B

Why is there a + with a - in front of the square root sign?

• It's a new operation

• you just pick one to use

• you use both, once with +, once with -

• eh, whatever

Tags

CCSS.HSA-REI.B.4B

• then your answer will be negative

• the quadratic has no solutions

• the quadratic has one solution

• the quadratic is crazy

Tags

CCSS.HSA-REI.B.4B