If z = 2 + i , Prove that :- z³ + 3z² - 9z + 8 = 1 + 14 i

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If z = 2 + i , show that z³ + 3z² - 9z + 8 = 1 + 14 i
if z=2+i ,prove that z^3+3z^2-9z+8=1+14i
If z=2+i, prove that z^(3)+3z^(2)-9z+8=(1+14i)
If z = 2 + i, prove that `z^(3) + 3z^(2) - 9z + 8 = (1 + 14i)
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