Quadratic Formula and Complex Numbers

Simplify √-1

• 1
• -i
• -1
• i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

 $\sqrt{-4}$ 

• -2

• -2i

• 2

• 2i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.C.7

CCSS.HSN.RN.A.2

√28

• 7√2
• 7√4
• 4√7
• 2√7

Tags

CCSS.HSN.RN.A.2

Simplify √-28

• -√28
• -2i√7
• 2i√7
• 28i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

CCSS.HSN.RN.A.2

Simplify -3√-8

• -3i√8

• -6i√2

• 6i√2

• -8i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

CCSS.HSN.RN.A.2

Simplify -1/3 √-90

• -i √10

• i √10

• -3i √10

• 3i √10

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

CCSS.HSN.RN.A.2

What should you do first in solving this equation?
x² + 6x - 13 = 3

• Get factored form
• Write down: a=1, b=6, c=-13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

Tags

CCSS.HSA-REI.B.4B

 $x^2-2x-8=0$  Solve using the Quadratic Formula:

•  $\frac{-1\pm\sqrt{73}}{6}$  

•  $-4,\ 2$  

•  $-2,\ 4$  

•  $-3,\ 2$  

Tags

CCSS.HSA-REI.B.4B

Use the quadratic formula to find the solutions for
 $y=-x^2-5x+12$  

• No Real Solution

•  $\frac{5\pm\sqrt{73}}{-2}$  

•  $\frac{-5\pm\sqrt{73}}{-2}$  

•  $\frac{5\pm\sqrt{73}}{2}$  

Tags

CCSS.HSA-REI.B.4B

Solve using the Quadratic Formula: $-x^2+4x=13$  

•  $2\pm3i$  

•  $-2\pm3i$  

•  $2\pm i\sqrt{17}$  

•  $-2\pm i\sqrt{17}$  

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7