AM-1673

Chain rule

A Math · Secondary 4 · Medium · Chain rule

The curve has equation

y = (0.4x + 2)^{-1}

. Find

\dfrac{dy}{dx}

.

$\dfrac{dy}{dx} = -0.4(0.4x+2)^{-2}$
$\dfrac{dy}{dx} = (0.4x+2)^{-2}$
$\dfrac{dy}{dx} = -2(0.4x+2)^{-1}$
$\dfrac{dy}{dx} = -0.4(0.4x+2)^{-1}$

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