1.

Explain the fallacy : `-1 =(i xx i)=sqrt(-1)xx sqrt(-1) = sqrt((-1)xx(-1))=sqrt(1) = 1`.

Answer» We know that for any real numbers a and b, `sqrt(a) xx sqrt(b) = sqrt(ab)` is true only when at least one of a and b is either 0 or positive.
`therefore" "sqrt(-1) xx sqrt(-1) ne sqrt((-1)xx(-1))`.


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