Mitchell solved a quadratic equation. His work is shown below.

In which step did Mitchell make an error?

5 (x-2) ² + 6=86

5 (x-2) ²=80 Step 1

(x-2) ²=16 Step 2

x²-2²=16 Step 3

x²=20 Step 4

x=±√20 Step 5

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