Q. Express z1=−83+8i in polar form.Express your answer in exact terms, using degrees, where your angle is between 0∘ and 360∘, inclusive.z1=
Identify Coordinates: Identify the rectangular coordinates of the complex number. The complex number z1=−83+8i has rectangular coordinates (−83,8).
Calculate Magnitude: Calculate the magnitude (r) of the complex number.The magnitude is found using the formula r=x2+y2, where x and y are the real and imaginary parts, respectively.r=(−83)2+82r=64⋅3+64r=192+64r=256r=16
Find Argument in Radians: Calculate the argument θ of the complex number in radians.The argument is found using the formula θ=atan2(y,x).θ=atan2(8,−83)Since the complex number is in the second quadrant (negative real part, positive imaginary part), the angle θ will be between 90∘ and 180∘.
Convert to Degrees: Convert the argument to degrees.To convert radians to degrees, we use the formula degrees=radians×(π180).However, we can directly calculate the angle in degrees using the atan2 function and considering the quadrant.θ=atan2(8,−83)=135° (since it is in the second quadrant)
Express in Polar Form: Express the complex number in polar form.The polar form of a complex number is z=r(cos(θ)+isin(θ)), where r is the magnitude and θ is the argument.Using the magnitude and argument calculated, the polar form is:z1=16(cos(135°)+isin(135°))
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