Question #117710
Find the modulus and the principal arguement of each of the given complex numbers
a. 3-4i b. -2+i c. 1/1+i(2)½ d. 7-i/-3-3i
1
Expert's answer
2020-05-26T18:30:48-0400

a. 34i=9+16=5,arg(34i)=arctan(4/3)530|3-4i|=\sqrt{9+16}=5,arg(3-4i)=\arctan (-4/3)\approx-53^0

b.2+i=4+1=5,arg(2+i)=arctan(1/2)+1800153.40|-2+i|=\sqrt{4+1}=\sqrt5,arg(-2+i)=\arctan(-1/2)+180^0\approx153.4^0

c.11+2i=1i21+2=1/3i2/3=1/9+2/9=3/3|\frac{1}{1+\sqrt2i}|=|\frac{1-i\sqrt2}{1+2}|=|1/3-i\sqrt2/3|=\sqrt{1/9+2/9}=\sqrt3/3

arg11+i2=arctan(2)54.70arg\frac{1}{1+i\sqrt2}=\arctan(-\sqrt2)\approx54.7^0

d.7i33i=(7i)(1i)32=1+i4/3=1+16/9=5/3|\frac{7-i}{-3-3i}|=|-\frac{(7-i)(1-i)}{3\sdot2}|=|-1+i4/3|=\sqrt{1+16/9}=5/3

arg(1+i4/3)=arctan(4/3)+18001270arg(-1+i4/3)=\arctan(-4/3)+180^0\approx127^0


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