Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(-9+9i\\ r = \sqrt{(-9)^2+9^2} = \sqrt{162} \\ \alpha = tan^{-1}(\frac{9}{-9}) \Leftrightarrow \alpha =135^\circ \text{ of } \alpha = 315^\circ \\-9+9i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 135^\circ \)
2. \(4+9i\\ r = \sqrt{4^2+9^2} = \sqrt{97} \\ \alpha = tan^{-1}(\frac{9}{4}) \Leftrightarrow \alpha =66^\circ 2' 15"\text{ of } \alpha = 246^\circ 2' 15"\\4+9i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 66^\circ 2' 15"\)
3. \(-10+7i\\ r = \sqrt{(-10)^2+7^2} = \sqrt{149} \\ \alpha = tan^{-1}(\frac{7}{-10}) \Leftrightarrow \alpha =145^\circ 0' 28{,}7"\text{ of } \alpha = 325^\circ 0' 28{,}7"\\-10+7i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 145^\circ 0' 28{,}7"\)
4. \(6\\ \text{ Dit complex getal ligt op het positief gedeelte van de x-as. We hebben geen berekeningen nodig om r of } \alpha \text{ te berekenen.} \\\text{r = }6\\\alpha = 0 ^\circ \\\)
5. \(2+2i\\ r = \sqrt{2^2+2^2} = \sqrt{8} \\ \alpha = tan^{-1}(\frac{2}{2}) \Leftrightarrow \alpha =45^\circ \text{ of } \alpha = 225^\circ \\2+2i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 45^\circ \)
6. \(-9+i\\ r = \sqrt{(-9)^2+1^2} = \sqrt{82} \\ \alpha = tan^{-1}(\frac{1}{-9}) \Leftrightarrow \alpha =173^\circ 39' 35{,}3"\text{ of } \alpha = 353^\circ 39' 35{,}3"\\-9+i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 173^\circ 39' 35{,}3"\)
7. \(10-5i\\ r = \sqrt{10^2+(-5)^2} = \sqrt{125} \\ \alpha = tan^{-1}(\frac{-5}{10}) \Leftrightarrow \alpha =153^\circ 26' 5{,}8"\text{ of } \alpha = 333^\circ 26' 5{,}8"\\10-5i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 333^\circ 26' 5{,}8"\)
8. \(9-3i\\ r = \sqrt{9^2+(-3)^2} = \sqrt{90} \\ \alpha = tan^{-1}(\frac{-3}{9}) \Leftrightarrow \alpha =161^\circ 33' 54{,}2"\text{ of } \alpha = 341^\circ 33' 54{,}2"\\9-3i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 341^\circ 33' 54{,}2"\)
9. \(-7-3i\\ r = \sqrt{(-7)^2+(-3)^2} = \sqrt{58} \\ \alpha = tan^{-1}(\frac{-3}{-7}) \Leftrightarrow \alpha =23^\circ 11' 54{,}9"\text{ of } \alpha = 203^\circ 11' 54{,}9"\\-7-3i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 203^\circ 11' 54{,}9"\)
10. \(6+10i\\ r = \sqrt{6^2+10^2} = \sqrt{136} \\ \alpha = tan^{-1}(\frac{10}{6}) \Leftrightarrow \alpha =59^\circ 2' 10{,}5"\text{ of } \alpha = 239^\circ 2' 10{,}5"\\6+10i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 59^\circ 2' 10{,}5"\)
11. \(8+7i\\ r = \sqrt{8^2+7^2} = \sqrt{113} \\ \alpha = tan^{-1}(\frac{7}{8}) \Leftrightarrow \alpha =41^\circ 11' 9{,}3"\text{ of } \alpha = 221^\circ 11' 9{,}3"\\8+7i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 41^\circ 11' 9{,}3"\)
12. \(4-7i\\ r = \sqrt{4^2+(-7)^2} = \sqrt{65} \\ \alpha = tan^{-1}(\frac{-7}{4}) \Leftrightarrow \alpha =119^\circ 44' 41{,}6"\text{ of } \alpha = 299^\circ 44' 41{,}6"\\4-7i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 299^\circ 44' 41{,}6"\)