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2. Find the derivatives of the following functions. \( \begin{array}{ll}\text { a) } y=\left(5-2 x^{2}\right)^{6} & \text { b) } y=\frac{1}{(\sqrt{x}-x)^{3}} \\ \text { c) } y=\frac{3}{2 \sqrt{x+1}} & \text { d) } y=(4 x-3)(1-2 x)^{4} \\ \text { e) } y=\frac{2 x-3}{x^{2}-5} & \text { f) } y=\left(x^{3}+1\right) \sqrt{2 x+7}\end{array} \)

Ask by Mitchell Moran. in Malaysia
Jan 22,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The derivative of \( y = (5 - 2x^{2})^{6} \) is \( \frac{dy}{dx} = -24x\, (5 - 2 x^{2})^{5} \).

Solution

Let's find the derivatives of each function step by step. ### **a) \( y = (5 - 2x^{2})^{6} \)** To differentiate \( y = (5 - 2x^{2})^{6} \), we'll use the **chain rule**. **Chain Rule:** If \( y = [u(x)]^n \), then \( y' = n \cdot [u(x)]^{n-1} \cdot u'(x) \). 1. **Identify the outer function and the inner function:** - Outer function: \( [u]^6 \) - Inner function: \( u = 5 - 2x^{2} \) 2. **Differentiate the outer function with respect to the inner function:** \[ \frac{d}{du} [u^{6}] = 6u^{5} \] 3. **Differentiate the inner function with respect to \( x \):** \[ \frac{du}{dx} = \frac{d}{dx} (5 - 2x^{2}) = -4x \] 4. **Apply the chain rule:** \[ \frac{dy}{dx} = 6u^{5} \cdot (-4x) = 6(5 - 2x^{2})^{5} \cdot (-4x) \] 5. **Simplify the expression:** \[ \frac{dy}{dx} = -24x (5 - 2x^{2})^{5} \] **Final Answer:** \[ \boxed{ \frac{dy}{dx} = -24x\, (5 - 2 x^{2})^{5} } \]

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Beyond the Answer

To find the derivatives of the given functions, we can apply common rules of differentiation like the chain rule, quotient rule, and product rule. Let's get ready to dive into some calculus magic! 1. For \( y = (5 - 2x^2)^6 \), we use the chain rule: \[ y' = 6(5 - 2x^2)^5 \cdot (-4x) = -24x(5 - 2x^2)^5 \] 2. For \( y = \frac{1}{(\sqrt{x} - x)^3} \), we will apply the quotient rule: \[ y' = -\frac{3(\sqrt{x} - x)^{-4}}{2\sqrt{x} - 1} \cdot \left(\frac{1}{2\sqrt{x}} - 1\right) \] 3. For \( y = \frac{3}{2\sqrt{x+1}} \), we can rewrite it as \( y = 3(2(x+1)^{1/2})^{-1} \) and apply the chain rule: \[ y' = -\frac{3}{2} \cdot (2(x + 1)^{-\frac{1}{2}}) \cdot \frac{1}{2} = -\frac{3}{4\sqrt{x + 1}} \] 4. For \( y = (4x - 3)(1 - 2x)^4 \), we apply the product rule: \[ y' = (4)(1 - 2x)^4 + (4x - 3)(4(1 - 2x)^3 \cdot (-2)) = 4(1 - 2x)^4 - 8(4x - 3)(1 - 2x)^3 \] 5. For \( y = \frac{2x - 3}{x^2 - 5} \), we will apply the quotient rule: \[ y' = \frac{(2)(x^2 - 5) - (2x - 3)(2x)}{(x^2 - 5)^2} = \frac{2x^2 - 10 - 4x^2 + 6x}{(x^2 - 5)^2} = \frac{-2x^2 + 6x - 10}{(x^2 - 5)^2} \] 6. For \( y = (x^3 + 1)\sqrt{2x + 7} \), we use the product rule: \[ y' = (3x^2)(\sqrt{2x + 7}) + (x^3 + 1)(\frac{1}{2\sqrt{2x + 7}} \cdot 2) = 3x^2\sqrt{2x + 7} + \frac{(x^3 + 1)}{\sqrt{2x + 7}} \] And there you have it! The derivatives of all the given functions, fresh off the calculus press. Happy differentiating!

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