Answer:
x = ±√37/9
Step-by-step explanation:
x² = 37/81
√(x²) = √(37/81)
x = ± √(37)/√(81)
x = ± √37/9
Recall the definition of absolute value.

When
,

When
,

The derivative does not exist at
, since the one-sided limits

and

do not match.
So the derivative of
is

Now we can write this as

since

and
