Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(3-5i\\ r = \sqrt{3^2+(-5)^2} = \sqrt{34} \\ \alpha = tan^{-1}(\frac{-5}{3}) \Leftrightarrow \alpha =120^\circ 57' 49{,}5"\text{ of } \alpha = 300^\circ 57' 49{,}5"\\3-5i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 300^\circ 57' 49{,}5"\)
2. \(-5-9i\\ r = \sqrt{(-5)^2+(-9)^2} = \sqrt{106} \\ \alpha = tan^{-1}(\frac{-9}{-5}) \Leftrightarrow \alpha =60^\circ 56' 43{,}4"\text{ of } \alpha = 240^\circ 56' 43{,}4"\\-5-9i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 240^\circ 56' 43{,}4"\)
3. \(6+5i\\ r = \sqrt{6^2+5^2} = \sqrt{61} \\ \alpha = tan^{-1}(\frac{5}{6}) \Leftrightarrow \alpha =39^\circ 48' 20{,}1"\text{ of } \alpha = 219^\circ 48' 20{,}1"\\6+5i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 39^\circ 48' 20{,}1"\)
4. \(8-8i\\ r = \sqrt{8^2+(-8)^2} = \sqrt{128} \\ \alpha = tan^{-1}(\frac{-8}{8}) \Leftrightarrow \alpha =135^\circ \text{ of } \alpha = 315^\circ \\8-8i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 315^\circ \)
5. \(-5-6i\\ r = \sqrt{(-5)^2+(-6)^2} = \sqrt{61} \\ \alpha = tan^{-1}(\frac{-6}{-5}) \Leftrightarrow \alpha =50^\circ 11' 39{,}9"\text{ of } \alpha = 230^\circ 11' 39{,}9"\\-5-6i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 230^\circ 11' 39{,}9"\)
6. \(7+9i\\ r = \sqrt{7^2+9^2} = \sqrt{130} \\ \alpha = tan^{-1}(\frac{9}{7}) \Leftrightarrow \alpha =52^\circ 7' 30{,}1"\text{ of } \alpha = 232^\circ 7' 30{,}1"\\7+9i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 52^\circ 7' 30{,}1"\)
7. \(-7-i\\ r = \sqrt{(-7)^2+(-1)^2} = \sqrt{50} \\ \alpha = tan^{-1}(\frac{-1}{-7}) \Leftrightarrow \alpha =8^\circ 7' 48{,}4"\text{ of } \alpha = 188^\circ 7' 48{,}4"\\-7-i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 188^\circ 7' 48{,}4"\)
8. \(-7+i\\ r = \sqrt{(-7)^2+1^2} = \sqrt{50} \\ \alpha = tan^{-1}(\frac{1}{-7}) \Leftrightarrow \alpha =171^\circ 52' 11{,}6"\text{ of } \alpha = 351^\circ 52' 11{,}6"\\-7+i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 171^\circ 52' 11{,}6"\)
9. \(1+2i\\ r = \sqrt{1^2+2^2} = \sqrt{5} \\ \alpha = tan^{-1}(\frac{2}{1}) \Leftrightarrow \alpha =63^\circ 26' 5{,}8"\text{ of } \alpha = 243^\circ 26' 5{,}8"\\1+2i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 63^\circ 26' 5{,}8"\)
10. \(8-4i\\ r = \sqrt{8^2+(-4)^2} = \sqrt{80} \\ \alpha = tan^{-1}(\frac{-4}{8}) \Leftrightarrow \alpha =153^\circ 26' 5{,}8"\text{ of } \alpha = 333^\circ 26' 5{,}8"\\8-4i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 333^\circ 26' 5{,}8"\)
11. \(5+i\\ r = \sqrt{5^2+1^2} = \sqrt{26} \\ \alpha = tan^{-1}(\frac{1}{5}) \Leftrightarrow \alpha =11^\circ 18' 35{,}8"\text{ of } \alpha = 191^\circ 18' 35{,}8"\\5+i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 11^\circ 18' 35{,}8"\)
12. \(10-3i\\ r = \sqrt{10^2+(-3)^2} = \sqrt{109} \\ \alpha = tan^{-1}(\frac{-3}{10}) \Leftrightarrow \alpha =163^\circ 18' 2{,}7"\text{ of } \alpha = 343^\circ 18' 2{,}7"\\10-3i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 343^\circ 18' 2{,}7"\)