Question

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plz answer as soon as possible....!!!​

Answer 1

$a + ib = \frac{c + i}{c - i} \times \frac{c + i}{c + i}$

$a + ib = \frac{c {}^{2} + i {}^{2} + 2ci }{c {}^{2} + i {}^{2} } \\ a + ib = \frac{c {}^{2} - 1 + 2ci }{c {}^{2} - 1} \\ a + ib =1 + \frac{2c}{c {}^{2} - 1 } i$

On comparison

a = 1

b = 2c / c² – 1

Hope the solution is clear to you!!