We are asked to differentiate the function $y = \sqrt[3]{(ax+b)^2}$ with respect to $x$.

AnalysisDifferentiationChain RuleDerivativesCalculus
2025/4/23

1. Problem Description

We are asked to differentiate the function y=(ax+b)23y = \sqrt[3]{(ax+b)^2} with respect to xx.

2. Solution Steps

First, we can rewrite the function using fractional exponents:
y=(ax+b)2/3y = (ax+b)^{2/3}
Now we can differentiate with respect to xx using the chain rule. The chain rule states that if y=f(g(x))y = f(g(x)), then dydx=f(g(x))g(x)\frac{dy}{dx} = f'(g(x)) \cdot g'(x).
In our case, f(u)=u2/3f(u) = u^{2/3} and g(x)=ax+bg(x) = ax+b.
The derivative of f(u)f(u) with respect to uu is:
f(u)=23u231=23u13f'(u) = \frac{2}{3} u^{\frac{2}{3} - 1} = \frac{2}{3} u^{-\frac{1}{3}}
The derivative of g(x)g(x) with respect to xx is:
g(x)=ag'(x) = a
Applying the chain rule, we have:
dydx=23(ax+b)13a=2a3(ax+b)13=2a3ax+b3\frac{dy}{dx} = \frac{2}{3} (ax+b)^{-\frac{1}{3}} \cdot a = \frac{2a}{3(ax+b)^{\frac{1}{3}}} = \frac{2a}{3\sqrt[3]{ax+b}}

3. Final Answer

dydx=2a3ax+b3\frac{dy}{dx} = \frac{2a}{3\sqrt[3]{ax+b}}

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