X/x^2-16-7/x^2+5x+4 simplify
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Let and
. Then
and
The expression under the square root can be rewritten as
Recall that
so that
and assuming and
, we end up with
so that
as required.
Let and
. Then
and
The expression under the square root can be rewritten as
Recall that
so that
and assuming and
, we end up with
so that
as required.