Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(-1-2i\\ r = \sqrt{(-1)^2+(-2)^2} = \sqrt{5} \\ \alpha = tan^{-1}(\frac{-2}{-1}) \Leftrightarrow \alpha =63^\circ 26' 5{,}8"\text{ of } \alpha = 243^\circ 26' 5{,}8"\\-1-2i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 243^\circ 26' 5{,}8"\)
2. \(1-5i\\ r = \sqrt{1^2+(-5)^2} = \sqrt{26} \\ \alpha = tan^{-1}(\frac{-5}{1}) \Leftrightarrow \alpha =101^\circ 18' 35{,}8"\text{ of } \alpha = 281^\circ 18' 35{,}8"\\1-5i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 281^\circ 18' 35{,}8"\)
3. \(2+9i\\ r = \sqrt{2^2+9^2} = \sqrt{85} \\ \alpha = tan^{-1}(\frac{9}{2}) \Leftrightarrow \alpha =77^\circ 28' 16{,}3"\text{ of } \alpha = 257^\circ 28' 16{,}3"\\2+9i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 77^\circ 28' 16{,}3"\)
4. \(5-4i\\ r = \sqrt{5^2+(-4)^2} = \sqrt{41} \\ \alpha = tan^{-1}(\frac{-4}{5}) \Leftrightarrow \alpha =141^\circ 20' 24{,}7"\text{ of } \alpha = 321^\circ 20' 24{,}7"\\5-4i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 321^\circ 20' 24{,}7"\)
5. \(4-9i\\ r = \sqrt{4^2+(-9)^2} = \sqrt{97} \\ \alpha = tan^{-1}(\frac{-9}{4}) \Leftrightarrow \alpha =113^\circ 57' 45"\text{ of } \alpha = 293^\circ 57' 45"\\4-9i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 293^\circ 57' 45"\)
6. \(-6\\ \text{ Dit complex getal ligt op het negatief gedeelte van de x-as. We hebben geen berekeningen nodig om r of } \alpha \text{ te berekenen.} \\\text{r = }6\\\alpha = 180 ^\circ \\\)
7. \(-6-3i\\ r = \sqrt{(-6)^2+(-3)^2} = \sqrt{45} \\ \alpha = tan^{-1}(\frac{-3}{-6}) \Leftrightarrow \alpha =26^\circ 33' 54{,}2"\text{ of } \alpha = 206^\circ 33' 54{,}2"\\-6-3i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 206^\circ 33' 54{,}2"\)
8. \(-9-7i\\ r = \sqrt{(-9)^2+(-7)^2} = \sqrt{130} \\ \alpha = tan^{-1}(\frac{-7}{-9}) \Leftrightarrow \alpha =37^\circ 52' 29{,}9"\text{ of } \alpha = 217^\circ 52' 29{,}9"\\-9-7i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 217^\circ 52' 29{,}9"\)
9. \(-4+7i\\ r = \sqrt{(-4)^2+7^2} = \sqrt{65} \\ \alpha = tan^{-1}(\frac{7}{-4}) \Leftrightarrow \alpha =119^\circ 44' 41{,}6"\text{ of } \alpha = 299^\circ 44' 41{,}6"\\-4+7i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 119^\circ 44' 41{,}6"\)
10. \(4+6i\\ r = \sqrt{4^2+6^2} = \sqrt{52} \\ \alpha = tan^{-1}(\frac{6}{4}) \Leftrightarrow \alpha =56^\circ 18' 35{,}8"\text{ of } \alpha = 236^\circ 18' 35{,}8"\\4+6i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 56^\circ 18' 35{,}8"\)
11. \(8-7i\\ r = \sqrt{8^2+(-7)^2} = \sqrt{113} \\ \alpha = tan^{-1}(\frac{-7}{8}) \Leftrightarrow \alpha =138^\circ 48' 50{,}7"\text{ of } \alpha = 318^\circ 48' 50{,}7"\\8-7i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 318^\circ 48' 50{,}7"\)
12. \(4-3i\\ r = \sqrt{4^2+(-3)^2} = \sqrt{25} \\ \alpha = tan^{-1}(\frac{-3}{4}) \Leftrightarrow \alpha =143^\circ 7' 48{,}4"\text{ of } \alpha = 323^\circ 7' 48{,}4"\\4-3i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 323^\circ 7' 48{,}4"\)