M11: Quadratic Equations & Complex Numbers Flashcards
1
Q
x² - 24 = 0
A
x = ±2 √―6
2
Q
-2i
A
√-4
3
Q
1/4x²+9=0
A
x = ±6i
4
Q
4x² = 24
A
x = ±√―6
5
Q
3i
A
√-9
6
Q
5i
A
-25
7
Q
x² = -81
A
x = ±9i
8
Q
x² + 64 = 0
A
x = ±8i
9
Q
2x² -16 = 0
A
x = ±2 √―2
10
Q
What kind of a number is the square of an imaginary number?
A
−b² or Bi
11
Q
(4 + 9i)(6 − 2i)
A
= 42 + 46i
12
Q
-5 x 2 - 2x - 8 = 0
A
2 ± √-156 1±i √39
=____________=________
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