Hello, beanus!
You "cancelled" incorrectly . . .
Multiply numerator and denominator by
. .
. .
Ok, so...
lim ((x-4)/x+4) / ((2/x)-(x/(x+4))
x->4
I multiplied by the common denominator x(x+4) and got
(x^2-4x)/(-x^2+2x+8)
simplified to
((x-2)(x+2)) / (-(x-4)(x+2))
simplified to
(x-2) / -(x-4)
simplified to
2/0
What did I do wrong?
Thanks