Christensen O'Quinn
07/15/2024 · Junior High School

Find \( f \) such that \( f^{\prime}(x)=4 x^{2}+3 x-3 \) and \( f(0)=7 \) \( f(x)=\square \)

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To find the function \( f(x) \) such that \( f'(x) = 4x^2 + 3x - 3 \) and \( f(0) = 7 \), we need to integrate the derivative \( f'(x) \). 1. **Integrate \( f'(x) \)**: \[ f(x) = \int (4x^2 + 3x - 3) \, dx \] We can integrate each term separately: - The integral of \( 4x^2 \) is \( \frac{4}{3}x^3 \). - The integral of \( 3x \) is \( \frac{3}{2}x^2 \). - The integral of \( -3 \) is \( -3x \). Therefore, we have: \[ f(x) = \frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + C \] where \( C \) is the constant of integration. 2. **Use the initial condition \( f(0) = 7 \)**: Substitute \( x = 0 \) into the equation: \[ f(0) = \frac{4}{3}(0)^3 + \frac{3}{2}(0)^2 - 3(0) + C = C \] Since \( f(0) = 7 \), we have: \[ C = 7 \] 3. **Write the final expression for \( f(x) \)**: Substitute \( C \) back into the equation for \( f(x) \): \[ f(x) = \frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + 7 \] Thus, the function \( f(x) \) is: \[ \boxed{\frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + 7} \]

Quick Answer

\[ f(x) = \frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + 7 \]
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