To simplify the expression \( 3i[(2i) + (-3i - 5)] \) using the Distributive Property, we follow these steps:
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First, simplify the expression inside the brackets: \[ (2i) + (-3i - 5) = 2i - 3i - 5 = -i - 5. \]
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Substitute this back into the expression: \[ 3i[-i - 5]. \]
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Now apply the Distributive Property: \[ 3i \cdot (-i) + 3i \cdot (-5). \]
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Calculate each term:
- For \( 3i \cdot (-i) \): \[ 3i \cdot (-i) = -3i^2. \] Since \( i^2 = -1 \), this becomes: \[ -3(-1) = 3. \]
- For \( 3i \cdot (-5) \): \[ 3i \cdot (-5) = -15i. \]
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Combine the results: \[ 3 - 15i. \]
Therefore, the expression \( 3i[(2i) + (-3i - 5)] \) in its simplest form is: \[ \boxed{3 - 15i}. \]