Adding a root is the root that makes the denominator of the equation zero.

Because there are unknowns in the denominator of the fractional equation, if the root is substituted into the equation to make the denominator zero, we say it is increasing the root. If there is no other root and only one added root, we say that the equation has no solution.

For example,

0/(X- 1)=X+ 1

And then x? - 1=0

Then X= 1 or-1.

When X= 1 is meaningless and the denominator is 0, then X= 1 is an incremental root. The solution of this fractional equation is X=- 1.

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