Math question

[deleted738762]

Sin is 2/x. I use P theorm to get...
b²=x²-4.
Then get √(b²)=√(x²-4)
giving b=√(x²-4)

Why isn't the answer x-2 or x²-2 since we are taking square root of both sides?
Thanks

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[molarbear8895]

If the values under the root were being multiplied or divoded you can simply remove the square with the root but if you are adding or subtracting you need to add/subtract then take the root of that. Since you have a variable you can't really go any further.
If you think about it P theorem would make no sense if you could just square both sides and have a+b=c