A-Level Maths: C1-04 [Coordinate Geometry: Examples of Finding the Distance between Two Points]

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I somewhat get confused when they say 'do not open the surd leave it be' and some teachers say 'open the surd' I honestly don't know what to do

Bff
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so, when using the equation, it simply doesn’t matter if you do (X1 - X2)^2 and (Y1 - Y2)^2 or (X2 - X1)^2 and (Y2 - Y1)^2?

noo
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Would you still get a mark on the exam if you don't simplify the surd value?

YaiseAkuma