Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(-2+9i\\ r = \sqrt{(-2)^2+9^2} = \sqrt{85} \\ \alpha = tan^{-1}(\frac{9}{-2}) \Leftrightarrow \alpha =102^\circ 31' 43{,}7"\text{ of } \alpha = 282^\circ 31' 43{,}7"\\-2+9i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 102^\circ 31' 43{,}7"\)
2. \(9-9i\\ r = \sqrt{9^2+(-9)^2} = \sqrt{162} \\ \alpha = tan^{-1}(\frac{-9}{9}) \Leftrightarrow \alpha =135^\circ \text{ of } \alpha = 315^\circ \\9-9i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 315^\circ \)
3. \(10-4i\\ r = \sqrt{10^2+(-4)^2} = \sqrt{116} \\ \alpha = tan^{-1}(\frac{-4}{10}) \Leftrightarrow \alpha =158^\circ 11' 54{,}9"\text{ of } \alpha = 338^\circ 11' 54{,}9"\\10-4i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 338^\circ 11' 54{,}9"\)
4. \(-6+4i\\ r = \sqrt{(-6)^2+4^2} = \sqrt{52} \\ \alpha = tan^{-1}(\frac{4}{-6}) \Leftrightarrow \alpha =146^\circ 18' 35{,}8"\text{ of } \alpha = 326^\circ 18' 35{,}8"\\-6+4i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 146^\circ 18' 35{,}8"\)
5. \(-8-i\\ r = \sqrt{(-8)^2+(-1)^2} = \sqrt{65} \\ \alpha = tan^{-1}(\frac{-1}{-8}) \Leftrightarrow \alpha =7^\circ 7' 30{,}1"\text{ of } \alpha = 187^\circ 7' 30{,}1"\\-8-i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 187^\circ 7' 30{,}1"\)
6. \(3+2i\\ r = \sqrt{3^2+2^2} = \sqrt{13} \\ \alpha = tan^{-1}(\frac{2}{3}) \Leftrightarrow \alpha =33^\circ 41' 24{,}2"\text{ of } \alpha = 213^\circ 41' 24{,}2"\\3+2i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 33^\circ 41' 24{,}2"\)
7. \(6+i\\ r = \sqrt{6^2+1^2} = \sqrt{37} \\ \alpha = tan^{-1}(\frac{1}{6}) \Leftrightarrow \alpha =9^\circ 27' 44{,}4"\text{ of } \alpha = 189^\circ 27' 44{,}4"\\6+i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 9^\circ 27' 44{,}4"\)
8. \(1-8i\\ r = \sqrt{1^2+(-8)^2} = \sqrt{65} \\ \alpha = tan^{-1}(\frac{-8}{1}) \Leftrightarrow \alpha =97^\circ 7' 30{,}1"\text{ of } \alpha = 277^\circ 7' 30{,}1"\\1-8i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 277^\circ 7' 30{,}1"\)
9. \(-6+10i\\ r = \sqrt{(-6)^2+10^2} = \sqrt{136} \\ \alpha = tan^{-1}(\frac{10}{-6}) \Leftrightarrow \alpha =120^\circ 57' 49{,}5"\text{ of } \alpha = 300^\circ 57' 49{,}5"\\-6+10i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 120^\circ 57' 49{,}5"\)
10. \(1+4i\\ r = \sqrt{1^2+4^2} = \sqrt{17} \\ \alpha = tan^{-1}(\frac{4}{1}) \Leftrightarrow \alpha =75^\circ 57' 49{,}5"\text{ of } \alpha = 255^\circ 57' 49{,}5"\\1+4i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 75^\circ 57' 49{,}5"\)
11. \(-9-10i\\ r = \sqrt{(-9)^2+(-10)^2} = \sqrt{181} \\ \alpha = tan^{-1}(\frac{-10}{-9}) \Leftrightarrow \alpha =48^\circ 0' 46"\text{ of } \alpha = 228^\circ 0' 46"\\-9-10i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 228^\circ 0' 46"\)
12. \(-9-5i\\ r = \sqrt{(-9)^2+(-5)^2} = \sqrt{106} \\ \alpha = tan^{-1}(\frac{-5}{-9}) \Leftrightarrow \alpha =29^\circ 3' 16{,}6"\text{ of } \alpha = 209^\circ 3' 16{,}6"\\-9-5i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 209^\circ 3' 16{,}6"\)