In the proof below, in which step does the first mistake occur?

**Step 1.**\(\ 2 = 1 + 1\)**Step 2.**\(\ 2 = 1 + \sqrt{1}\)**Step 3.**\(\ 2 = 1 + \sqrt{(-1)(-1)}\)**Step 4.**\(\ 2 = 1 + \sqrt{(-1)}\)\(\sqrt{(-1)}\)**Step 5.**\(\ 2 = 1 + (i)(i)\)**Step 6.**\(\ 2 = 1 + (-1)\)**Step 7.**\(\ 2 = 0\)

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