Find a value(s) that makes the expression

y^2 - 16
---------- undefined.
y^2 + 16

y=4i?

yes, and also -4i

y^2+16 = (y+4i)(y-4i)

Thank you!

To find the value(s) that make the expression undefined, we need to look at the denominator of the expression, which is y^2 + 16. If the denominator equals zero, then the expression is undefined.

If we substitute y = 4i into the denominator, we have:
(4i)^2 + 16

Simplifying, we get:
(-16 + 16) + 16 = 16

Since the denominator is not equal to zero, the given expression is not undefined when y = 4i.