Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(8-5i\\ r = \sqrt{8^2+(-5)^2} = \sqrt{89} \\ \alpha = tan^{-1}(\frac{-5}{8}) \Leftrightarrow \alpha =147^\circ 59' 40{,}6"\text{ of } \alpha = 327^\circ 59' 40{,}6"\\8-5i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 327^\circ 59' 40{,}6"\)
2. \(-9+4i\\ r = \sqrt{(-9)^2+4^2} = \sqrt{97} \\ \alpha = tan^{-1}(\frac{4}{-9}) \Leftrightarrow \alpha =156^\circ 2' 15"\text{ of } \alpha = 336^\circ 2' 15"\\-9+4i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 156^\circ 2' 15"\)
3. \(-9-i\\ r = \sqrt{(-9)^2+(-1)^2} = \sqrt{82} \\ \alpha = tan^{-1}(\frac{-1}{-9}) \Leftrightarrow \alpha =6^\circ 20' 24{,}7"\text{ of } \alpha = 186^\circ 20' 24{,}7"\\-9-i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 186^\circ 20' 24{,}7"\)
4. \(9+7i\\ r = \sqrt{9^2+7^2} = \sqrt{130} \\ \alpha = tan^{-1}(\frac{7}{9}) \Leftrightarrow \alpha =37^\circ 52' 29{,}9"\text{ of } \alpha = 217^\circ 52' 29{,}9"\\9+7i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 37^\circ 52' 29{,}9"\)
5. \(-5+8i\\ r = \sqrt{(-5)^2+8^2} = \sqrt{89} \\ \alpha = tan^{-1}(\frac{8}{-5}) \Leftrightarrow \alpha =122^\circ 0' 19{,}4"\text{ of } \alpha = 302^\circ 0' 19{,}4"\\-5+8i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 122^\circ 0' 19{,}4"\)
6. \(2+i\\ r = \sqrt{2^2+1^2} = \sqrt{5} \\ \alpha = tan^{-1}(\frac{1}{2}) \Leftrightarrow \alpha =26^\circ 33' 54{,}2"\text{ of } \alpha = 206^\circ 33' 54{,}2"\\2+i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 26^\circ 33' 54{,}2"\)
7. \(2-5i\\ r = \sqrt{2^2+(-5)^2} = \sqrt{29} \\ \alpha = tan^{-1}(\frac{-5}{2}) \Leftrightarrow \alpha =111^\circ 48' 5{,}1"\text{ of } \alpha = 291^\circ 48' 5{,}1"\\2-5i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 291^\circ 48' 5{,}1"\)
8. \(-1+10i\\ r = \sqrt{(-1)^2+10^2} = \sqrt{101} \\ \alpha = tan^{-1}(\frac{10}{-1}) \Leftrightarrow \alpha =95^\circ 42' 38{,}1"\text{ of } \alpha = 275^\circ 42' 38{,}1"\\-1+10i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 95^\circ 42' 38{,}1"\)
9. \(4+8i\\ r = \sqrt{4^2+8^2} = \sqrt{80} \\ \alpha = tan^{-1}(\frac{8}{4}) \Leftrightarrow \alpha =63^\circ 26' 5{,}8"\text{ of } \alpha = 243^\circ 26' 5{,}8"\\4+8i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 63^\circ 26' 5{,}8"\)
10. \(-7-5i\\ r = \sqrt{(-7)^2+(-5)^2} = \sqrt{74} \\ \alpha = tan^{-1}(\frac{-5}{-7}) \Leftrightarrow \alpha =35^\circ 32' 15{,}6"\text{ of } \alpha = 215^\circ 32' 15{,}6"\\-7-5i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 215^\circ 32' 15{,}6"\)
11. \(-3\\ \text{ Dit complex getal ligt op het negatief gedeelte van de x-as. We hebben geen berekeningen nodig om r of } \alpha \text{ te berekenen.} \\\text{r = }3\\\alpha = 180 ^\circ \\\)
12. \(-5-8i\\ r = \sqrt{(-5)^2+(-8)^2} = \sqrt{89} \\ \alpha = tan^{-1}(\frac{-8}{-5}) \Leftrightarrow \alpha =57^\circ 59' 40{,}6"\text{ of } \alpha = 237^\circ 59' 40{,}6"\\-5-8i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 237^\circ 59' 40{,}6"\)