Find the square root of `-3+4sqrt(-7)`

Explanation

To find the square root of the expression \(-3 + 4\sqrt{-7}\), we can follow these steps:

### Step 1: Rewrite the expression
First, we rewrite the expression by substituting \(\sqrt{-7}\) with \(i\sqrt{7}\), where \(i\) is the imaginary unit defined as \(i = \sqrt{-1}\).

\[ -3 + 4\sqrt{-7} = -3 + 4i\sqrt{7} \]
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