Bepaal modulus en argument

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Bepaal modulus en argument

1. \(-10-3i\)
2. \(-3i\)
3. \(-4+10i\)
4. \(-9+3i\)
5. \(1-3i\)
6. \(9-4i\)
7. \(-1+9i\)
8. \(8+5i\)
9. \(7-9i\)
10. \(-10-5i\)
11. \(6+6i\)
12. \(-5+10i\)

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Bepaal modulus en argument

Verbetersleutel

1. \(-10-3i\\ r = \sqrt{(-10)^2+(-3)^2} = \sqrt{109} \\ \alpha = tan^{-1}(\frac{-3}{-10}) \Leftrightarrow \alpha =16^\circ 41' 57{,}3"\text{ of } \alpha = 196^\circ 41' 57{,}3"\\-10-3i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 196^\circ 41' 57{,}3"\)
2. \(-3i\\ \text{ Dit complex getal ligt op het negatief gedeelte van de y-as. We hebben geen berekeningen nodig om r of } \alpha \text{ te berekenen.} \\\text{r = }3\\\alpha = 270 ^\circ \\\)
3. \(-4+10i\\ r = \sqrt{(-4)^2+10^2} = \sqrt{116} \\ \alpha = tan^{-1}(\frac{10}{-4}) \Leftrightarrow \alpha =111^\circ 48' 5{,}1"\text{ of } \alpha = 291^\circ 48' 5{,}1"\\-4+10i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 111^\circ 48' 5{,}1"\)
4. \(-9+3i\\ r = \sqrt{(-9)^2+3^2} = \sqrt{90} \\ \alpha = tan^{-1}(\frac{3}{-9}) \Leftrightarrow \alpha =161^\circ 33' 54{,}2"\text{ of } \alpha = 341^\circ 33' 54{,}2"\\-9+3i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 161^\circ 33' 54{,}2"\)
5. \(1-3i\\ r = \sqrt{1^2+(-3)^2} = \sqrt{10} \\ \alpha = tan^{-1}(\frac{-3}{1}) \Leftrightarrow \alpha =108^\circ 26' 5{,}8"\text{ of } \alpha = 288^\circ 26' 5{,}8"\\1-3i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 288^\circ 26' 5{,}8"\)
6. \(9-4i\\ r = \sqrt{9^2+(-4)^2} = \sqrt{97} \\ \alpha = tan^{-1}(\frac{-4}{9}) \Leftrightarrow \alpha =156^\circ 2' 15"\text{ of } \alpha = 336^\circ 2' 15"\\9-4i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 336^\circ 2' 15"\)
7. \(-1+9i\\ r = \sqrt{(-1)^2+9^2} = \sqrt{82} \\ \alpha = tan^{-1}(\frac{9}{-1}) \Leftrightarrow \alpha =96^\circ 20' 24{,}7"\text{ of } \alpha = 276^\circ 20' 24{,}7"\\-1+9i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 96^\circ 20' 24{,}7"\)
8. \(8+5i\\ r = \sqrt{8^2+5^2} = \sqrt{89} \\ \alpha = tan^{-1}(\frac{5}{8}) \Leftrightarrow \alpha =32^\circ 0' 19{,}4"\text{ of } \alpha = 212^\circ 0' 19{,}4"\\8+5i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 32^\circ 0' 19{,}4"\)
9. \(7-9i\\ r = \sqrt{7^2+(-9)^2} = \sqrt{130} \\ \alpha = tan^{-1}(\frac{-9}{7}) \Leftrightarrow \alpha =127^\circ 52' 29{,}9"\text{ of } \alpha = 307^\circ 52' 29{,}9"\\7-9i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 307^\circ 52' 29{,}9"\)
10. \(-10-5i\\ r = \sqrt{(-10)^2+(-5)^2} = \sqrt{125} \\ \alpha = tan^{-1}(\frac{-5}{-10}) \Leftrightarrow \alpha =26^\circ 33' 54{,}2"\text{ of } \alpha = 206^\circ 33' 54{,}2"\\-10-5i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 206^\circ 33' 54{,}2"\)
11. \(6+6i\\ r = \sqrt{6^2+6^2} = \sqrt{72} \\ \alpha = tan^{-1}(\frac{6}{6}) \Leftrightarrow \alpha =45^\circ \text{ of } \alpha = 225^\circ \\6+6i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 45^\circ \)
12. \(-5+10i\\ r = \sqrt{(-5)^2+10^2} = \sqrt{125} \\ \alpha = tan^{-1}(\frac{10}{-5}) \Leftrightarrow \alpha =116^\circ 33' 54{,}2"\text{ of } \alpha = 296^\circ 33' 54{,}2"\\-5+10i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 116^\circ 33' 54{,}2"\)