No. 9,786 in Russian
эффективными
"Effektivnymi" means "effective" or "efficient" (plural form).
In a sentence
Эти методы обучения являются эффективными.
These teaching methods are effective.
Here, 'эффективными' is used as a predicate adjective in instrumental plural form to describe 'методы' (methods).
Многие упражнения оказались эффективными для изучения иностранного языка.
Many exercises turned out to be effective for learning a foreign language.
In this example, 'эффективными' is in instrumental plural form and complements the action 'оказались' (turned out).
Чтобы достичь результата, методы должны быть эффективными.
To achieve results, methods must be effective.
Here, 'эффективными' is part of a predicate, describing the required quality of 'методы' (methods).
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