Calculus based or calculus-based?

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I've noticed something strange in the literature. Regardless of context, there seems to be a trend where some authors will say 'calculus-based solution' or 'calculus-based physics' whereas others will not use the hyphen and say something like 'calculus based bound'. In my own writing, I've usually stuck to avoiding the hyphen, however I'm starting to have my doubts. Is one of these choices always correct? Or is there a relevant set of rules of grammar?

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Solved by caverac's link in the comments. https://www.grammarbook.com/punctuation/hyphens.asp suffix rule 1. Use the hyphen always.