-1 = 1

Algebra Level 2

I have found a proof that 1=1-1=1. Or have I? If you think one of these steps is wrong, input your answer as the step number.

Step 1: 1-1
Step 2: =i2={ i }^{ 2 }
Step 3: =i×i=i\times i
Step 4: =1×1=\sqrt { -1 } \times \sqrt { -1 }
Step 5: =1×1=\sqrt { -1\times -1 }
Step 6: =1=\sqrt { 1 }
Step 7: =1=1

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