Now i was taught that when you have an equation such as x^2=9 and you take the sqrt bs of this equation sqrt(x^2)=sqrt(p) you get |x|=3. I was also told that sqrt only returns a positive(non-negative) value. I asked a friend but he was too busy to finish explaining and i just got even more confused. So my question is why do you need the abs value on the x if you know that sqrt is non-negative?
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