Is 0.2 a root of the equation x2 - 0.4 = 0? Justify your answer.
No, 0.2 is not a root of the equation x2 - 0.4 = 0.
If we substitute the value 0.2 in place of x in the equation, x2 - 0.4 = 0
⇒ (0.2)2 - 0.4 ≠ 0