WAEC - Further Mathematics (2019 - No. 32)

If y = (5 - x)\(^{-3}\), and \(\frac{dy}{dx}\)
\(\frac{-15}{(5 - x)^4}\)
\(\frac{-3}{(5 - x)^4}\)
\(\frac{3}{(5 - x)^4}\)
\(\frac{15}{(5 - x)^4}\)

Explanation

y = (5 - x)\(^{-3}\) 

\(\frac{dy}{dx}\) = -3(5 - x)\(^{-4}\)

= \(\frac{-3}{(5 - x)^4}\)

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