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Prove that all roots of z' 5z + 12 = 0 lie between the circles z = 1 and z = 2

Prove that all roots of z' 5z + 12 = 0 lie between the circles z = 1 and z = 2

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Rouches Theorem tells us that if we can show that gz fz on a closed contour then fz and ... blur-text-image
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