Question

Check if \( y = x^3 - 5x + 2 \) satisfies the differential equation \( \frac{dy}{dx} = 3x^2 - 5 \).

Ask by Flynn Goodwin. in the United States
Dec 11,2024

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Tutor-Verified Answer

Answer

Yes, \( y = x^3 - 5x + 2 \) satisfies the differential equation.

Solution

To check if the function \( y = x^3 - 5x + 2 \) satisfies the differential equation \( \frac{dy}{dx} = 3x^2 - 5 \), we first need to compute the derivative of \( y \) with respect to \( x \). Starting with the function: \[ y = x^3 - 5x + 2 \] we differentiate \( y \) with respect to \( x \): \[ \frac{dy}{dx} = \frac{d}{dx}(x^3) - \frac{d}{dx}(5x) + \frac{d}{dx}(2) \] Calculating each term: 1. The derivative of \( x^3 \) is \( 3x^2 \). 2. The derivative of \( -5x \) is \( -5 \). 3. The derivative of the constant \( 2 \) is \( 0 \). Putting it all together, we have: \[ \frac{dy}{dx} = 3x^2 - 5 \] Now, we compare this result with the right-hand side of the differential equation: \[ \frac{dy}{dx} = 3x^2 - 5 \] Since both sides are equal, we conclude that the function \( y = x^3 - 5x + 2 \) does indeed satisfy the differential equation \( \frac{dy}{dx} = 3x^2 - 5 \). Thus, the answer is: \[ \text{Yes, } y = x^3 - 5x + 2 \text{ satisfies the differential equation.} \]

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Beyond the Answer

To check if \( y = x^3 - 5x + 2 \) satisfies the differential equation \( \frac{dy}{dx} = 3x^2 - 5 \), we first need to find the derivative of \( y \) with respect to \( x \). Calculating the derivative: \[ \frac{dy}{dx} = \frac{d}{dx}(x^3 - 5x + 2) \] Using the power rule and the linearity of derivatives, we get: \[ \frac{dy}{dx} = 3x^2 - 5 \] Now, we compare this result with the right side of the differential equation: The derivative we found, \( \frac{dy}{dx} = 3x^2 - 5 \), is exactly the same as the right side of the given differential equation \( \frac{dy}{dx} = 3x^2 - 5 \). Thus, we can conclude that the function \( y = x^3 - 5x + 2 \) does indeed satisfy the differential equation \( \frac{dy}{dx} = 3x^2 - 5 \).

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