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Let's solve all of them to see :
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There's only one solution , thus it's not what we want.
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And


There are two solutions but none of them is what we want .
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There's no solution because square of any number is greater than or equal zero
which means :

Thus x² never can be a negative number.
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And


These are exactly the solutions what we want ;
Thus the correct answer is the last one.
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