What does i² = ?

• -1

• $\sqrt{-1}$

• 1

• $-\sqrt{1}$

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

Simplify the following. $-\sqrt{-49}$  

• 7

• -7

• 7i

• -7i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

Simplify the following.  $\sqrt{-54}$  

•   $3i\sqrt{6}$  

•  $-3\sqrt{6}$  

•  $14i\sqrt{13}$  

•  $-13\sqrt{5}$  

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

Multiply
 $3i\left(-2+4i\right)$  

• -6+12i

• -12-6i

• -2+7i

• 12+6i

Tags

CCSS.HSA.APR.A.1

Simplify the following.
 $\sqrt{-36}$  

• 6

• -6

• -6i

• 6i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

-4i + 7i

• 3i
• 11i
• -11i
• 8 - 4i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

-7i - 7 + 5i

• -7 - 12i
• 7 - 2i
• -7 + 12i
• -7 - 2i

Tags

CCSS.HSA.APR.A.1

Calculate: 
-12i + 7i

• 19i
• -19i
• 5i
• -5i

Tags

CCSS.HSA.APR.D.7

Calculate (multiply):
 (4 + 3i)(4 − 3i)

• 16 − 9i²
• 25
• 7
• 8 − 6i

Tags

CCSS.HSN.CN.C.8

Calculate (multiply):
(1 − 2i)(6 + 5i)

• 16 − 7i
• -16 + 7i
• -16 − 7i
• 16 + 7i

Tags

CCSS.HSA.APR.A.1