I can not enter some mathematical symbols

Hi there, thanks for providing us with support.
My problem with KaTeX is this.
When I try to write the following line (in HTML) for a new post on my web site with WordPress
[Latex] n \ leq x <n + 2 [/ latex]
I only get this on the way out
N \ leq x <n + 2 [/ latex]
That is, no mathematical symbol appears in the output article.
However if I write equations, such as:
[Latex] ax ^ 2 + bx + c = 0 [/ latex]
(\ Sum_ {k = 1} ^ n a_k ^ 2 \ right) \ left (\ sum_ {k = 1} ^ n a_k b_k \ \ Sum_ {k = 1} ^ n b_k ^ 2 \ right) [/ latex]
Yes they can visualize perfectly.
How is this resolved? I’ve tried everything and I can not fix it.
Thanks in advance for your prompt response.
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