Express 2-3i whole cube in the form of a+ib
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(2-3i)cube (a-b)cube=acube-bcube-3asqureb-3absquare.substitute in that formula
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( 2 - 3 i)³ = 2³ - (3 i)³ + 3 * 2² * (-3i) - 3 * 2 * (-3 i)²
= 8 + 27 i - 36 i + 54
= 62 - 9 i
= 8 + 27 i - 36 i + 54
= 62 - 9 i
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