To simplify the expression \(-17 + 5 + 3i - 8\), we can combine the real parts and the imaginary parts separately.
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Combine the real parts: \[ -17 + 5 - 8 = -20 \]
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The imaginary part is just: \[ 3i \]
Putting it all together, we get: \[ -20 + 3i \]
Therefore, the expression in the form of \(a + bi\) is \(-20 + 3i\).