Is 0.2 a root of the equation

Question:

Is 0.2 a root of the equation x2 – 0.4 = 0? Justify your answer.

Solution:

No, since 0.2 does not satisfy the quadratic equation i.e., ( 0.2)2 – 0.4 = 0.04 – 0.4 ≠0.

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