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zijie41596's Question
Math
Posted 6 months ago
6) Find the complex square roots of 8+8i3-8+8 i \sqrt{3}. Give answers in rectangular form.
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Answer from Sia
Posted 6 months ago
Solution by Steps
step 1
To find the complex square roots of 8+8i3-8+8i\sqrt{3}, we first express the complex number in polar form
step 2
The magnitude of the complex number is (8)2+(83)2=64+192=256=16\sqrt{(-8)^2+(8\sqrt{3})^2} = \sqrt{64+192} = \sqrt{256} = 16
step 3
The argument (angle) θ\theta of the complex number is arctan(838)=arctan(3)\arctan\left(\frac{8\sqrt{3}}{-8}\right) = \arctan(-\sqrt{3}), which is 5π3\frac{5\pi}{3} or 2π3\frac{2\pi}{3}, considering the complex number is in the second quadrant
step 4
The polar form is 16(cos(θ)+isin(θ))16(\cos(\theta) + i\sin(\theta)). Using the two possible values for θ\theta, we have 16(cos(5π3)+isin(5π3))16(\cos(\frac{5\pi}{3}) + i\sin(\frac{5\pi}{3})) and 16(cos(2π3)+isin(2π3))16(\cos(\frac{2\pi}{3}) + i\sin(\frac{2\pi}{3}))
step 5
To find the square roots, we take the square root of the magnitude and halve the angles. The magnitude of the square roots is 16=4\sqrt{16} = 4
step 6
The angles for the square roots are 5π6\frac{5\pi}{6} and π3\frac{\pi}{3}
step 7
The two complex square roots in polar form are 4(cos(5π6)+isin(5π6))4(\cos(\frac{5\pi}{6}) + i\sin(\frac{5\pi}{6})) and 4(cos(π3)+isin(π3))4(\cos(\frac{\pi}{3}) + i\sin(\frac{\pi}{3}))
step 8
Converting these back to rectangular form, we get 4(32+12i)4\left(-\frac{\sqrt{3}}{2} + \frac{1}{2}i\right) and 4(12+32i)4\left(\frac{1}{2} + \frac{\sqrt{3}}{2}i\right)
step 9
Simplifying, we obtain the complex square roots: 23+2i-2\sqrt{3} + 2i and 2+23i2 + 2\sqrt{3}i
Answer
23+2i-2\sqrt{3} + 2i and 2+23i2 + 2\sqrt{3}i
Key Concept
Finding complex square roots
Explanation
To find the square roots of a complex number, we convert it to polar form, take the square root of the magnitude, and halve the angle. Then we convert the result back to rectangular form.

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