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Find the real value of a for which 3i^3 - 2ai^2 + (1 – a)i + 5 is real.

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Find the real value of a for which 3i3 - 2ai2 + (1 – a)i + 5 is real.

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we have, 3i3 - 2ai2 + (1 – a)i+ 5 

⟹ -3i+ 2a + (1 – a)i + 5 

⟹ (2a + 5) + i(1 – a – 3) 

⟹ (2a + 5) – i(2 + a)

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