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How to extract the square root

Sagot :

example lng to :

x^2 - 16 = 0
x^2 - 16 + 16 = 0 + 16
(or transpose x^2 - 16 {ililipat kaya magiging positive 16} = 16)
then x^2 = 16
       √x^2 = √16
answer -  x  =  4