It's getting complex

Algebra Level 3

When x=3+5i2\color{#20A900}{x}=\dfrac {3+5i}{2},find the value of 2x3+2x27x+722\color{#20A900}{x}^3+2\color{#20A900}{x}^2-7\color{#20A900}{x}+72.

Note:i=1i=\sqrt {-1}.

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