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Otrada [13]
3 years ago
6

How to find first Derivative of -2(e^2x+1)^3?

Mathematics
1 answer:
Dima020 [189]3 years ago
5 0

Use the chain rule. Let

y=-2(e^{2x}+1)^3

and take u=e^{2x}+1. The chain rule says

\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm du}\cdot\dfrac{\mathrm du}{\mathrm dx}

The relevant derivatives are then

\dfrac{\mathrm dy}{\mathrm du}=\dfrac{\mathrm d(-2u^3)}{\mathrm du}=-6u^2

(power rule)

\dfrac{\mathrm du}{\mathrm dx}=\dfrac{\mathrm d(e^{2x}+1)}{\mathrm dx}=2e^{2x}

(chain rule applied to e^{2x}; the constant vanishes)

So,

\dfrac{\mathrm dy}{\mathrm dx}=-6u^2\cdot2e^{2x}=-12e^{2x}(e^{2x}+1)^2

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