Subjects calculus

Implicit Derivative C097Ae

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1. **State the problem:** We need to find \(\frac{dy}{dx}\) for the equation $$2 y^3 + 2 x^2 = 4$$ using implicit differentiation. 2. **Recall the rule:** When differentiating implicitly, treat \(y\) as a function of \(x\), so use the chain rule for terms involving \(y\). The derivative of \(y^n\) with respect to \(x\) is $$n y^{n-1} \frac{dy}{dx}$$. 3. **Differentiate both sides with respect to \(x\):** $$\frac{d}{dx}(2 y^3) + \frac{d}{dx}(2 x^2) = \frac{d}{dx}(4)$$ 4. **Apply the derivatives:** - For \(2 y^3\), use the chain rule: $$2 \cdot 3 y^2 \frac{dy}{dx} = 6 y^2 \frac{dy}{dx}$$ - For \(2 x^2\), derivative is: $$2 \cdot 2 x = 4 x$$ - The derivative of constant 4 is 0. So the differentiated equation is: $$6 y^2 \frac{dy}{dx} + 4 x = 0$$ 5. **Solve for \(\frac{dy}{dx}\):** $$6 y^2 \frac{dy}{dx} = -4 x$$ Divide both sides by \(6 y^2\): $$\frac{dy}{dx} = \frac{-4 x}{6 y^2}$$ Show cancellation: $$\frac{dy}{dx} = \frac{\cancel{2} \cdot -2 x}{\cancel{2} \cdot 3 y^2} = \frac{-2 x}{3 y^2}$$ 6. **Final answer:** $$\boxed{\frac{dy}{dx} = \frac{-2 x}{3 y^2}}$$ This is the derivative of \(y\) with respect to \(x\) found by implicit differentiation.