When do u switch places on a number when ur calculating with roots. for example. √(1-√2)². and then it becomes √2-1. WHYYYY???
When a sqrt is written into a question, only the positive root is required. 1-sqrt2 is negative so that is not the correct root. The correct one would be -(1-sqrt2) = -1+sqrt2 = sqrt2-1
eg
sqrt[ (-2) 2 ] = sqrt (4) = 2
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