The problem asks us to differentiate the function $y = \sqrt[3]{(ax+b)^2}$ with respect to $x$.

AnalysisDifferentiationChain RuleDerivativesCalculus
2025/4/22

1. Problem Description

The problem asks us to differentiate the function y=(ax+b)23y = \sqrt[3]{(ax+b)^2} with respect to xx.

2. Solution Steps

First, rewrite the function using fractional exponents:
y=(ax+b)23y = (ax+b)^{\frac{2}{3}}
Now, we differentiate yy with respect to xx using the chain rule. The chain rule states that if y=f(u)y = f(u) and u=g(x)u = g(x), then dydx=dydududx\frac{dy}{dx} = \frac{dy}{du} \cdot \frac{du}{dx}.
Let u=ax+bu = ax + b. Then y=u23y = u^{\frac{2}{3}}.
dydu=23u231=23u13\frac{dy}{du} = \frac{2}{3}u^{\frac{2}{3}-1} = \frac{2}{3}u^{-\frac{1}{3}}
dudx=ddx(ax+b)=a\frac{du}{dx} = \frac{d}{dx}(ax+b) = a
Using the chain rule:
dydx=dydududx=23u13a=2a3(ax+b)13\frac{dy}{dx} = \frac{dy}{du} \cdot \frac{du}{dx} = \frac{2}{3}u^{-\frac{1}{3}} \cdot a = \frac{2a}{3}(ax+b)^{-\frac{1}{3}}
Rewrite the expression with the cube root:
dydx=2a3ax+b3\frac{dy}{dx} = \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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