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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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12y ago

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Q: How do you solve x2-81 equals 0?
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