Bepaal modulus en argument

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Bepaal modulus en argument

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

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Bepaal modulus en argument

Verbetersleutel

1. \(1-2i\\ r = \sqrt{1^2+(-2)^2} = \sqrt{5} \\ \alpha = tan^{-1}(\frac{-2}{1}) \Leftrightarrow \alpha =116^\circ 33' 54{,}2"\text{ of } \alpha = 296^\circ 33' 54{,}2"\\1-2i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 296^\circ 33' 54{,}2"\)
2. \(7+8i\\ r = \sqrt{7^2+8^2} = \sqrt{113} \\ \alpha = tan^{-1}(\frac{8}{7}) \Leftrightarrow \alpha =48^\circ 48' 50{,}7"\text{ of } \alpha = 228^\circ 48' 50{,}7"\\7+8i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 48^\circ 48' 50{,}7"\)
3. \(-10-4i\\ r = \sqrt{(-10)^2+(-4)^2} = \sqrt{116} \\ \alpha = tan^{-1}(\frac{-4}{-10}) \Leftrightarrow \alpha =21^\circ 48' 5{,}1"\text{ of } \alpha = 201^\circ 48' 5{,}1"\\-10-4i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 201^\circ 48' 5{,}1"\)
4. \(8+7i\\ r = \sqrt{8^2+7^2} = \sqrt{113} \\ \alpha = tan^{-1}(\frac{7}{8}) \Leftrightarrow \alpha =41^\circ 11' 9{,}3"\text{ of } \alpha = 221^\circ 11' 9{,}3"\\8+7i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 41^\circ 11' 9{,}3"\)
5. \(3-6i\\ r = \sqrt{3^2+(-6)^2} = \sqrt{45} \\ \alpha = tan^{-1}(\frac{-6}{3}) \Leftrightarrow \alpha =116^\circ 33' 54{,}2"\text{ of } \alpha = 296^\circ 33' 54{,}2"\\3-6i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 296^\circ 33' 54{,}2"\)
6. \(10+4i\\ r = \sqrt{10^2+4^2} = \sqrt{116} \\ \alpha = tan^{-1}(\frac{4}{10}) \Leftrightarrow \alpha =21^\circ 48' 5{,}1"\text{ of } \alpha = 201^\circ 48' 5{,}1"\\10+4i\text{ ligt in kwadrant }1, \alpha \text{ ligt dus tussen }0^\circ \text{ en }90^\circ\\ \alpha = 21^\circ 48' 5{,}1"\)
7. \(3-7i\\ r = \sqrt{3^2+(-7)^2} = \sqrt{58} \\ \alpha = tan^{-1}(\frac{-7}{3}) \Leftrightarrow \alpha =113^\circ 11' 54{,}9"\text{ of } \alpha = 293^\circ 11' 54{,}9"\\3-7i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 293^\circ 11' 54{,}9"\)
8. \(5-10i\\ r = \sqrt{5^2+(-10)^2} = \sqrt{125} \\ \alpha = tan^{-1}(\frac{-10}{5}) \Leftrightarrow \alpha =116^\circ 33' 54{,}2"\text{ of } \alpha = 296^\circ 33' 54{,}2"\\5-10i\text{ ligt in kwadrant }4, \alpha \text{ ligt dus tussen }270^\circ \text{ en }360^\circ\\ \alpha = 296^\circ 33' 54{,}2"\)
9. \(-6-10i\\ r = \sqrt{(-6)^2+(-10)^2} = \sqrt{136} \\ \alpha = tan^{-1}(\frac{-10}{-6}) \Leftrightarrow \alpha =59^\circ 2' 10{,}5"\text{ of } \alpha = 239^\circ 2' 10{,}5"\\-6-10i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 239^\circ 2' 10{,}5"\)
10. \(-4+6i\\ r = \sqrt{(-4)^2+6^2} = \sqrt{52} \\ \alpha = tan^{-1}(\frac{6}{-4}) \Leftrightarrow \alpha =123^\circ 41' 24{,}2"\text{ of } \alpha = 303^\circ 41' 24{,}2"\\-4+6i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 123^\circ 41' 24{,}2"\)
11. \(-3+8i\\ r = \sqrt{(-3)^2+8^2} = \sqrt{73} \\ \alpha = tan^{-1}(\frac{8}{-3}) \Leftrightarrow \alpha =110^\circ 33' 21{,}8"\text{ of } \alpha = 290^\circ 33' 21{,}8"\\-3+8i\text{ ligt in kwadrant }2, \alpha \text{ ligt dus tussen }90^\circ \text{ en }180^\circ\\ \alpha = 110^\circ 33' 21{,}8"\)
12. \(-10-9i\\ r = \sqrt{(-10)^2+(-9)^2} = \sqrt{181} \\ \alpha = tan^{-1}(\frac{-9}{-10}) \Leftrightarrow \alpha =41^\circ 59' 14"\text{ of } \alpha = 221^\circ 59' 14"\\-10-9i\text{ ligt in kwadrant }3, \alpha \text{ ligt dus tussen }180^\circ \text{ en }270^\circ\\ \alpha = 221^\circ 59' 14"\)