The (complex) solutions of the equation \( 2 z^{2}+2 i z-5=0 \) are \( \ldots \) \( \begin{array}{l}z_{1}=-1.5-0.5 i \text { and } z_{2}=1.5+0.5 i \\ z_{1}=-0.5-1.5 i \text { and } z_{2}=0.5+1.5 i \\ z_{1}=-1.5-0.5 i \text { and } z_{2}=1.5-0.5 i \\ z_{1}=1.5+0.5 i \text { and } z_{2}=1.5-0.5 i\end{array} \)
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Beyond the Answer
To solve the equation \( 2 z^{2}+2 i z-5=0 \), we can use the quadratic formula \( z = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \). Here, \( a = 2 \), \( b = 2i \), and \( c = -5 \). Calculating the discriminant gives us \( b^2 - 4ac = (2i)^2 - 4(2)(-5) = -4 + 40 = 36 \). Thus, \( z = \frac{-2i \pm 6}{4} \), leading to two solutions: \( z_1 = -1.5 - 0.5i \) and \( z_2 = 1.5 + 0.5i \). In real-world applications, solving complex equations can model systems in electrical engineering and quantum mechanics, where impedances and wave functions often yield complex numbers. By understanding these solutions, engineers can analyze and predict circuit behavior, while physicists can describe particle states, benefiting technological advancements in computing and telecommunications.
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