Question on: JAMB Mathematics - 1998

If y = 243(4x + 5)-2, find (\frac{dy}{dx}) when x = 1

A
\(\frac{-8}{3}\)
B
\(\frac{3}{8}\)
C
\(\frac{9}{8}\)
D
-\(\frac{8}{9}\)
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Correct Option: A

y = 243(4x + 5)-2, find (\frac{dy}{dx})

= -1944(4x + 5)-3

= 1944(9)-3

(\frac{dy}{dx}) when x = 1

= -(\frac{1944}{9^3})

= -(\frac{1944}{729})

= (\frac{-8}{3})

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