z=3−4iFind the angle θ (in radians) that z makes in the complex plane. Round your answer, if necessary, to the nearest thousandth. Express θ between −π and π.θ=
Q. z=3−4iFind the angle θ (in radians) that z makes in the complex plane. Round your answer, if necessary, to the nearest thousandth. Express θ between −π and π.θ=
Identify Parts of z: Identify the real and imaginary parts of the complex number z.z=3−4i, where the real part is 3 and the imaginary part is −4.
Calculate Magnitude of z: Calculate the magnitude of z. The magnitude of z is given by the square root of the sum of the squares of the real and imaginary parts. ∣z∣=32+(−4)2=9+16=25=5.
Find Theta Using Definition: Use the definition of the argument of a complex number to find θ. The argument of a complex number, θ, is the angle the line connecting the origin to the point (real, imaginary) makes with the positive real axis. θ=arctan(real partimaginary part)=arctan(3−4).
Calculate Theta with Arctan: Calculate θ using the arctan function.θ=arctan(−34).Since the complex number is in the fourth quadrant (real part is positive, imaginary part is negative), we need to add π to the result of arctan to get the angle in the correct range.θ=arctan(−34)+π.
Use Calculator for Theta: Use a calculator to find the value of theta.θ=arctan(−34)+π≈−0.927+3.142≈2.215 (rounded to the nearest thousandth).
Verify Theta Range: Verify that theta is within the correct range. The range for theta is between −π and π. Since 2.215 is within this range, our answer is valid.
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