justify the statement that 0.2 is a root of the equation x2 -4=0

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This statement says that, 0.2 is the root of the given equation. This means that if x has the value 0.2, then the equation will be equal to 0 ( simply called as zero of the polynomial) . But, on substituting x with 0.2, you will not get 0. The only roots possible for this equation are 2 and -2.


Hence, 0.2 is not a root of the above equation.
 
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