Solving Quadratic Equations

Solve -2x² + 4x = 9

• (2 - i√14)/2   ,   (2 + i√14)/2
• (2 - i√-56)/2   ,   (2 + i√-56)/2
• (2 - i√-14)/2   ,   (2 + i√-14)/2
• (2 - √14)/2   ,   (2 + √14)/2

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

Which is a solution to x² - 4x + 5 = 0

• 2 + i
• 2i
• 2 - 2i
• -2 - i

Tags

CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4

2x² – 6x + 5 = 0 

• x=3/2±i/2
• x=3 ± i/2
• x=3/2 ± i
• x=3±i

Tags

CCSS.HSA.REI.B.4

Solve for x using the quadratic formula. 
2x² + 10x + 18 = 0

• A.  - 5 ± i√44 
  -----------------
      2
• B. -5 ± i √11
  ----------------
      2
• C. 5 ± √11
  --------------
     2
• D. -10 ± 2i√11
  ----------------
  2

Solve using square roots.      3x² - 15 = 0

• x = -√5
• x = 5 and -5
• x = √5
• x = √5 and -√5

• A
• B
• C
• D

Simplify
 (9 + 3i)(9 - 3i). 

• 81 -9i
• 90
• 81 + 27i -9i²
• 81i - 9

Simplify
(10+3i) - (2-9i)

• 20-27i
• 12-7i
• 8+12i
• 20-27i²

Simplify.

• ±10
• ±50
• ±10i
• No solution

Solve by taking the square root:

(x + 6)² = 1

• -5, -7

• 5, 7

• 5, -7

• -5, 7