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Expanding Binomial Expressions (simple)
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Algorithms
Algebra
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Binomial expansion is a duplicate: https://www.codewars.com/kata/540d0fdd3b6532e5c3000b5b
There are no random tests. Actual tests are the same as sample tests.
What is a invalid expression is not defined. Why is
(5y+7)invalid? It is because ofy, or the lack of exponent?(Also, you didn't specify what should be done in this case.)
It's very obvious expressions like
42x^33^1are not valid expressions. (Why are you concatenating 3 terms directly?)