solution to 2.16

diff --git a/src/sicp/ex2_16.clj b/src/sicp/ex2_16.clj
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+"This is already explained partly in 2.15. Any operation like
+A = A^3/A^2, will yield a different interval than the original A.
+
+How do we fix this? One way is to do algebraic reduction of the
+expression before doing any interval arithmetic.
+
+Are there some better ways? I am very interested to hear. The
+usual literature (wikipedia et al) seem to be mum on these
+important issues."
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