0
2x - 81 = 0
Add 81 to both sides.
2x - 81 + 81 = 0 + 81
Substitute, -81 + 81 cancels out.
2x = 81
Divide by 2.
x = 40.5
Above answer would be correct if your question was 2x but it was x2 so using the same method you would get
x2 = 81 here the opposite of the square is the square root
x = 9
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