Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(-8-8i\\ r = \sqrt{(-8)^2+(-8)^2} = \sqrt{128} \\ \alpha = tan^{-1}(\frac{-8}{-8}) \Leftrightarrow \alpha =45^\circ \text{ of } \alpha = 225^\circ \\-8-8i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 225^\circ \)
2. \(-6-5i\\ r = \sqrt{(-6)^2+(-5)^2} = \sqrt{61} \\ \alpha = tan^{-1}(\frac{-5}{-6}) \Leftrightarrow \alpha =39^\circ 48' 20{,}1"\text{ of } \alpha = 219^\circ 48' 20{,}1"\\-6-5i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 219^\circ 48' 20{,}1"\)
3. \(-3-6i\\ r = \sqrt{(-3)^2+(-6)^2} = \sqrt{45} \\ \alpha = tan^{-1}(\frac{-6}{-3}) \Leftrightarrow \alpha =63^\circ 26' 5{,}8"\text{ of } \alpha = 243^\circ 26' 5{,}8"\\-3-6i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 243^\circ 26' 5{,}8"\)
4. \(-3-6i\\ r = \sqrt{(-3)^2+(-6)^2} = \sqrt{45} \\ \alpha = tan^{-1}(\frac{-6}{-3}) \Leftrightarrow \alpha =63^\circ 26' 5{,}8"\text{ of } \alpha = 243^\circ 26' 5{,}8"\\-3-6i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 243^\circ 26' 5{,}8"\)
5. \(-6+5i\\ r = \sqrt{(-6)^2+5^2} = \sqrt{61} \\ \alpha = tan^{-1}(\frac{5}{-6}) \Leftrightarrow \alpha =140^\circ 11' 39{,}9"\text{ of } \alpha = 320^\circ 11' 39{,}9"\\-6+5i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 140^\circ 11' 39{,}9"\)
6. \(-7-9i\\ r = \sqrt{(-7)^2+(-9)^2} = \sqrt{130} \\ \alpha = tan^{-1}(\frac{-9}{-7}) \Leftrightarrow \alpha =52^\circ 7' 30{,}1"\text{ of } \alpha = 232^\circ 7' 30{,}1"\\-7-9i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 232^\circ 7' 30{,}1"\)
7. \(-6-7i\\ r = \sqrt{(-6)^2+(-7)^2} = \sqrt{85} \\ \alpha = tan^{-1}(\frac{-7}{-6}) \Leftrightarrow \alpha =49^\circ 23' 55{,}3"\text{ of } \alpha = 229^\circ 23' 55{,}3"\\-6-7i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 229^\circ 23' 55{,}3"\)
8. \(-6+i\\ r = \sqrt{(-6)^2+1^2} = \sqrt{37} \\ \alpha = tan^{-1}(\frac{1}{-6}) \Leftrightarrow \alpha =170^\circ 32' 15{,}6"\text{ of } \alpha = 350^\circ 32' 15{,}6"\\-6+i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 170^\circ 32' 15{,}6"\)
9. \(-9\\ \text{ Dit complex getal ligt op het negatief gedeelte van de x-as. We hebben geen berekeningen nodig om r of } \alpha \text{ te berekenen.} \\\text{r = }9\\\alpha = 180 ^\circ \\\)
10. \(8-7i\\ r = \sqrt{8^2+(-7)^2} = \sqrt{113} \\ \alpha = tan^{-1}(\frac{-7}{8}) \Leftrightarrow \alpha =138^\circ 48' 50{,}7"\text{ of } \alpha = 318^\circ 48' 50{,}7"\\8-7i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 318^\circ 48' 50{,}7"\)
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. \(7+7i\\ r = \sqrt{7^2+7^2} = \sqrt{98} \\ \alpha = tan^{-1}(\frac{7}{7}) \Leftrightarrow \alpha =45^\circ \text{ of } \alpha = 225^\circ \\7+7i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 45^\circ \)