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Can anyone help with pre- alerba

Can anyone help with pre- alerba-example-1
User Howes
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Answer:


√(x^2) = |x|

Explanation:


√(x^2) = |x|

The radical symbol when used for a square root means the non-negative square root. You cannot state that sqrt(x^2) = x because x may be negative. That is why you need use the absolute value symbol.

User Martin Cowie
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