1/20 +3i/20

1/20 - 3i/20

-1/20 + 3i/20

-1/20 - 3i/20

8 + 5i

8 - 5i

2 + 5i

2 - 5i

9 + 2i

9 - 2i

8 + 2i

8 - 2i

(13 - 4i) / 25

(13 + 4i) / 25

-(13 - 4i) / 25

-(13 + 4i) / 25

5

50

5√10

10√5

1

1.5

2

2.5

3 + i , -3 - i

3 - i , -3 + i

10 - i , -10 - i

10 - i , -10 + i

±(2√2 + 2√2i)

±(2√2 - 2√2i)

±(2 + 2i)

±(2 - 2i)

±(9 + 8i)

±(9 - 8i)

±(9 - 6i)

±(9 + 6i)

z = 2(cos 30°+isin 30°)

z = 2(cos 45°+isin 45°)

z = 2(cos 60°+isin 60°)

z = 2(cos 90°+isin 90°)

z = √2(cos 45° + isin 45°)

z = √2(cos 135° + isin 135°)

z = √2(cos 225° + isin 225°)

z = √2(cos 315° + isin 315°)

-64

-64i

64

64i

z₁z₂ = r₁r₂ [ cos(θ₁+θ₂)+isin(θ₁+θ₂)]

1/z₂ = (1/r₂ )*[ cos θ₂ + isin θ₁ ]

z₁/z₂ = (r₁/r₂) _* [ cos(θ₁- θ₂)+isin(θ₁ - θ₂)]

̅z₁ = r₁ [ cos(- θ₁)+isin(- θ₁)]

2 [ cos π/9 + isin π/9]

2 [ cos 7π/9 + isin 7π/9]

2 [ cos 13π/9 + isin 13π/9]

2 [ cos 5π/9 + isin 5π/9]

2√2i

-2i

√2

-√2i

0

1

2

3

2 คำตอบ

3 คำตอบ

4 คำตอบ

5 คำตอบ

(x² - 10)(x² + 4) = 0

(x² - 2)(x² + 20) = 0

(x² - 8)(x² + 5) = 0

(x² - 4)(x² + 10) = 0

{ -1 , 1/4 + √7i/4 , 1/4 - √7i/4}

{ 1 , 1/4 + √7i/4 , 1/4 - √7i/4}

{ -1 , 1/4 + √11i/4 , 1/4 - √11i/4}

{ 1 , 1/4 + √11i/4 , 1/4 - √11i/4}